PTO Manual of Classification for US patents

PTO Manual of Classification for US patents

What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.


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363-131 121-55A 14-.5
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Class Number: 180
 Class Title: MOTOR VEHICLES

Subclass  Subclass
Number    Title

  164     WITH POWERED MEANS FOR CREATING FLUID FORCE TO ATTRACT VEHICLE
           TO SURFACE OF TRAVEL
  116     SURFACE EFFECT VEHICLES (I.E., GROUND EFFECT MACHINES)
  117     .Having propulsion or control means
  118     ..Responsive to instability condition
  119     ..Surface contacting control
  120     ..Integrated with working fluid
  121     ...With plural cushions
  122     ...With dynamic seal or fluid curtain
  123     .Spray deflector
  124     .Expansible chamber
  125     .Fluid bearing or fluid pad
  126     .Rigid side walls
  127     .Flexible skirt
  128     ..Having outlet for working fluid
  129     .Dynamic seal or fluid curtain
  130     ..Recirculating
  165     WITH FLUID OR MECHANICAL MEANS TO ACCUMULATE ENERGY (I) DERIVED
           FROM MOTION OF VEHICLE OR (II) OBTAINED FROM OPERATION OF
           VEHICLE MOTOR, AND GIVE UP THE ENERGY (1) WHEN NEEDED FOR
           VEHICLE ACCELERATION OR (2) TO POWER AN AUXILIARY SYSTEM OF THE
           VEHICLE
  166     WHEELED INFANT CARRIAGE OR CRIB WITH DRIVEN MEANS FOR
           RECIPROCATING IT LONGITUDINALLY
  2.1     MOTOR SUPPLIED WITH POWER FROM EXTERNAL SOURCE
  2.2     .Source comprises or includes energy derived from force of
            nature (e.g., sun, wind)
  167     WITH MEANS FOR CONTROLLING OPERATION RESPONSIVE TO
           ELECTROMAGNETIC RADIATION, MAGNETIC FORCE, OR SOUND WAVES
           RECEIVED FROM SOURCE, OR REFLECTED FROM OBJECT OR SURFACE,
           LOCATED APART FROM VEHICLE
  168     .Having controlling means adapted to interact with stationary
            means which describes course of vehicle's travel
  169     .Radiation, force, or waves reflected from external object or
            surface
  170     WITH MEANS RESPONSIVE TO SPEED OF VEHICLE FOR MAINTAINING SPEED
           AT, OR PREVENTING IT FROM EXCEEDING, A PARTICULAR VALUE
  171     .Including device to signal to operator existence of unusual or
            unintended speed
  172     .Including device responsive to centrifugal force
  173     ..And means to prevent tampering or unauthorized use
  174     ..Having electrical switch
  175     .Including fluid pressure actuated servomechanism
  176     ..And electrical quantities comparison means for development of
             input pressure
  177     ..And one or more electrical components for establishing or
             regulating input pressure
  178     .Including electrically actuated servomechanism
  179     ..And electrical quantities comparison means for development of
             electrical input
  180     SKI- OR SKATE-TYPE VEHICLE FOR IMPARTING MOVEMENT TO A PERSON
           STANDING THEREONN
  181     .With power means or a portion thereof affixed to or built into
            the ski or skate
  182     INCLUDING ONE OR MORE SKI-LIKE OR RUNNER MEMBERS
  183     .Member substitutable for wheel type support structure
  184     ..With propulsion element of endless track type
  185     ...Track comprises substitute for or addition to propulsion
              element of traction wheel type
  186     .With at least one surface-engaging propulsion element
  187     ..Element shuffles along support surface
  188     ..Spiral type element
  189     ..Plural elements connected to and spaced along the plural
             throws of a common crankshaft
  190     ..Endless track type element
  191     ...Protruding from member
  192     ...Plural tracks with interconnected drive or support means
  193     ...With vertically movable track support located intermediate
              the forward and rearward extremities of the track
  194     ..Plural discrete elements protruding from a wheel, hub, or
             shaft
  195     ...Each element moves relative to wheel, hub, or shaft
  196     ..Element comprises traction wheel
  197     WITH MEANS FOR DETECTING WHEEL SLIP DURING VEHICLE ACCELERATION
           AND CONTROLLING IT BY REDUCING APPLICATION OF POWER TO WHEEL
  198     PORTABLE CARRIER SUPPORTS MOTOR VEHICLE IN TOTO AND IS PROPELLED
           THEREBY
  199     WITH POWERED, GROUND-ENGAGING MEANS FOR PRODUCING, OR ASSISTING
           IN THE PRODUCTION OF, LATERAL MOVEMENT OF THE VEHICLE (E.G., FOR
           PARKING)
  200     .Comprising rotatably driven auxiliary wheel or endless track
  201     ..Driven by frictional engagement with tire of vehicle traction
             wheel
  202     ..Driven by auxiliary electric or fluid motor
  203     .Comprising reciprocably driven stepper or rotatably driven cam
  204     WITH DEVICE FOR PROGRAMMABLY OPERATING VEHICLE'S STEERABLE
           WHEELS DURING PARKING MANEUVER THEREOF
  6.2     STEERING BY DRIVING
  6.24    .Combined with manual steering
  6.26    ..Interlocked
  6.28    ...Electrical
  6.3     ...Fluid
  6.32    ...Lever and/or linkage
  6.34    ....With controller cam
  6.36    ....Lost motion type
  6.38    ....Geared
  6.4     ....With flexible and/or yieldable link
  6.44    .Auxiliary steering motor
  6.48    .Independently operable drive motors
  6.5     ..Electrical
  6.54    .Variable contact
  6.58    .Controlled from rotatably mounted superstructure
  6.6     ..Steering responsive to rotary movement of superstructure
  6.62    .Combined
  6.64    .Swinging traction frame responsive to differential drive
  6.66    .Reversing drive to traction element
  6.7     .Endless flexible track
  7.1     SPECIAL DRIVING DEVICE
  7.2     .Spiral type element
  7.3     .Reaction jet propulsionn
  7.4     .Propeller type
  7.5     .Vehicle mounted winch for pulling vehicle
  8.1     .Stepper
  8.2     ..Step or abutment ascending/desending type vehicle
  8.3     ..Wheel and stepper type
  8.4     ...Nonsupporting pusher type stepper
  8.5     ..With alternately lifted supporting base and leg
  8.6     ..With alternately lifted feet or skid
  8.7     ..Endless or rotary type
  9       .Portable track
  9.1     ..Endless, flexible
  9.21    ...Track substituted for drive wheel
  9.22    ...Guided by walking attendant
  9.23    ...With attendant station
  9.25    ....Rider straddles vehicle (e.g., motorcycle)
  9.26    ...Convertible from wheel type
  9.28    ....Track remains with vehicle
  9.3     .....Wheel or track contacts ground
  9.32    ...With auxiliary obstacle surmounting means
  9.34    ...With ground wheel
  9.36    ....Opposite and laterally spaced
  9.38    ....Steering
  9.4     ...With hitch
  9.42    ...Combined
  9.44    ...With track-related steering means
  9.46    ....Pivoted track frame
  9.48    ...Laterally extendable track
  9.5     ...Track support mounted for vertical movement
  9.52    ....Adjustable
  9.54    ....With spring
  9.56    .....Longitudinally extending coil spring
  9.58    .....Leaf or torsion spring
  9.6     ......Transversely extending
  9.62    ...Toothed wheel drive
  9.64    ....Belt or chain driven
  10      ..Annular
  11      MOTOR-CARRYING ATTACHMENTS
  12      .Driven steering wheel type
  13      ..Single wheel
  14.1    VEHICLE TRAINS
  14.2    .Motorized trailer
  14.3    ..All motors supplied from power plant of a single vehicle
  14.4    .Drive means betwen vehicles through coupling
  14.6    .Tractor drive effort varied by pull exerted by trailer
  14.7    .Vehicle drive drives other vehicle wheel
  14.5    .Overload release
  15      ADDITIONAL TRACTION WHEEL
  16      TRACTION WHEEL ATTACHMENTS
  19.1    STEERED BY WALKING ATTENDANT
  19.2    .Who steerably controls steerable wheel
  19.3    .Handle movement controls vehicle drive
  20      WITH ROLLERS
  21      SPECIAL WHEEL BASE
  22      .Five or more wheels
  23      ..Driven steering wheel type
  24      ...Stub-axle type
  24.01   ..Having tandem steerable or translatable wheels or wheel
             setss
  24.02   ..Displaceable wheel shifts or proportions load
  24.03   ..Independently rotatable side-by-side dual wheels
  24.04   ..With differential housing integrally fixed to vehicle
             frame
  24.05   ..Rocker beam houses drive means
  24.06   ..Plural propelling motors
  24.07   ...Separate driving motor for each drive wheel
  24.08   ..Each wheel positively driven
  24.09   ..With interaxle differential
  24.1    ..With drive interrupt means to either tandem drive wheel
  24.11   ..Driven tandem wheels
  24.12   ...One serially driven by other
  24.13   ..Spring rocker beam
  205     .With mechanism of occupant-powered type for developing torque
            for supplementing, alternating with, or replacing torque of
            motor
  206     ..And means for controlling motor in response to either
             operation of occupant powered mechanism or vehicular movement
             resulting therefrom
  207     ..Including member utilized in common by occupant-powered
             mechanism and by motor for transmitting torque output of each
             to wheel
  208     .Collapsible or knockdown for storage or transport
  209     .With means for changing number of supporting wheels, or for
            adjusting relative location thereof
  210     .Having only three wheels
  211     ..Including steerable and driven wheel
  212     ...All wheels motor driven
  213     ...Having motor mounted to swing with steerable wheel
  214     ....Electrical-type motor
  215     ..Including two wheels driven and having common axis of
             rotation
  216     ...Electrical-type motor
  217     ...Including endless element for transmitting drive to wheels
  218     .Having only two wheels
  219     ..Arranged in tandem
  220     ...Electrical-type motor
  221     ...Including rotating element for frictionally engaging and
              driving a wheel
  222     ....And means for steering that wheel
  223     ...Including steerable and driven wheel
  224     ....Both wheels motor driven
  225     ...Having frame element or fender constituting also exhaust or
              fuel passageway or fuel reservoir
  226     ...Including longitudinally extending shaft for transmitting
              drive to wheel
  227     ...Including resilient means for mounting driven wheel
  228     ...Including resilient means for mounting motor
  229     ...With means for cooling motor
  230     ...With change-speed means between motor and driven wheel
  231     ...Including endless element for transmitting drive and means
              for adjusting tension of element
  36      STEAM TRACTION ENGINES
  37      .Driven steering wheel type
  38      ..Four wheels driven
  39      .With boiler leveler
  40      .Spring mounted on axle
  232     WITH MEANS FOR (1) PROTECTING MOTOR FROM IMPACT OF COLLISION,,
           (2) UTILIZING MASS OF MOTOR TO ABSORB FORCE THEREOF, OR (3)
           PROTECTING OCCUPANT REGION OF VEHICLE FROM IMPACT-INDUCED
           SHIFTING OF MOTOR
  41      WITH LEVELING DEVICE
  233     HAVING FOUR WHEELS DRIVEN
  234     .With means for steering all driven wheels
  235     ..Comprising articulated frame and means for pivoting one
             portion of frame relative to other portion about vertical axis
             located centrally of vehicle
  236     ..In a path of travel other than that produced by turning the
             front wheels and the rear wheels substantially equally and
             oppositely
  237     ..Comprising swingable, plural-wheel-carrying axles on
             individual, vertical axes of pivot
  238     ...At least one axle being offset from its pivotable axis
  239     ...Including longitudinally extending, endless element for
              transmitting drive to wheels
  240     ..Including rotatable shaft extending longitudinally from wheels
             at one end of vehicle to wheels at other end for transmitting
             steering force thereto
  241     ..Including longitudinally extending, endless element for
             transmitting drive to wheels
  242     .Including pump and fluid motor, or generator and electric
            motor, for driving one or more wheels
  243     ..And another means for driving the remaining driven wheels
  244     .With means for braking either (1) one or more driven wheels or
            (2) structure transmitting drive to wheel
  245     .Including separate mechanical assemblies for transmitting drive
            to each of two wheels at one end of vehicle
  246     ..And assemblies for each of two wheels at other end, also
  247     .With manually operated means for disengaging drive to one or
            more, but fewer than all, of the four wheels
  248     .With differential means for driving two wheel sets at
            dissimilar speeds
  249     ..And means for locking out the differential means
  250     ...Manually operated type of lockout means
  251     .Including longitudinally extending, endless element for
            transmitting drive to wheels
  252     HAVING AT LEAST ONE WHEEL BOTH DRIVEN AND STEERABLE
  253     .Steerable wheel has exclusive axis of pivot (i.e., stub-axle
            type)
  254     ..Including flexible, axially rotatable means having one portion
             fixed to vehicle and another portion pivotable with wheel for
             transmitting drive thereto
  255     ...Pivotable portion of means has additional structure of
              gearlike nature in driving engagement with corresponding
              structure on wheel
  256     ...Means comprises rotatable shaft containing plural universal
              joints
  257     ....Having at least one joint located on each side of axis of
               pivot
  258     ...Pivotable portion of means includes ball or socket element of
              ball-and socket type universal joint
  259     ....Joint includes intermediate ball, floating in groove, for
               positively engaging ball with socket
  260     ...Pivotable portion of means includes gear element of
              intermeshing gear type universal joint
  261     ....Joint includes at least one gear element rotatable on axiss
               of pivot and intermeshing with gear element on pivotable
               portion
  262     .....Joint also includes gear element on fixed portion engaging
                gear element on axis of pivot and vertically offset from
                gear element on pivotable portion
  263     ...Having axis of pivot disposed between parallel planes defined
              by opposite sides of wheel
  264     .With driven axle, mounting two or more wheels, swingable about
            axis of pivot, and motor mounted to swing therewith
  265     ..Having axle offset longitudinally from axis of pivot
  266     .With driven axle, mounting two or more wheels, swingable about
            axis of pivot, and swingable also about a horizontal axis
  267     .With driven axle, mounting two or more wheels, swingable about
            axis of pivot, and shaft for transmitting drive coincident with
            axis
  268     WITH BELT OR HARNESS FOR RESTRAINING OCCUPANT, AND MEANS WHEREBY
           THE BELT OR HARNESS CONTROLS, OR IS CONTROLLED BY, THE
           FUNCTIONING OF A VEHICLE SYSTEM OR COMPONENT
  269     .System comprises transmission or element thereof
  270     .System comprises ignition circuit or starter circuit or element
            of one or other
  271     WITH MEANS FOR PROMOTING SAFETY OF VEHICLE, ITS OCCUPANT OR
           LOAD, OR AN EXTERNAL OBJECT
  272     .Responsive to absence or inattention of operator, or negatively
            reactive to attempt to operate vehicle by person not qualified
            mentally or physically to do so
  273     ..Utilizing weight, or lack thereof, of operator on seat or
             other support to determine presence or absence
  274     .Responsive to engagement of portion of perimeter of vehicle
            with external object
  275     ..And causing application of vehicle brake
  276     ...Brake comprises or includes element moved or deformed into
              engagement with ground
  277     ...And also interruption of at least one operational system of
              the vehicle or its motor
  278     ....System comprises clutch
  279     ..And causing interruption of an electrical system of the
             vehicle or its motor
  280     ..And causing operation of vehicle steering system
  281     .Comprising either movable closure member or fastening device
            therefor responsive to forward or rearward movement, or
            variations therein, of vehicle
  282     .Responsive to sensing of acceleration, deceleration, or tilt of
            vehicle
  283     ..And causing interruption of ignition circuit
  284     ...And also impeding flow of fuel
  285     ..And causing disruption of drive train between motor and
             wheels
  286     .Comprising vehicle system or component responsive either to
            position of movable closure member or to status of fastening
            device therefor
  287     .By preventing unauthorized or unintended access or use
  288     ..Reponsive to failure of taxicab operator to activate fare
             meter upon boarding of passenger
  289     ..Comprising device, mechanism, or system for either
             repositioning a movable or removable closure member or
             operating a fastening device therefor
  290     .Responsive to weight of cargo load transported by vehiclee
  53.1    MOTOR AS SOURCE OF POWER FOR OTHER MACHINE
  53.2    .Other machine is creeper drive on motor vehicle
  53.3    .Other machine is mounted by three point hitch (i.e.,
            Ford-Ferguson hitch)
  53.4    .Hydraulic drive to other machine
  53.5    .Electric drive to other machine
  53.6    .Drive to other machine by power take-off (PTO) driven by
            wheel or axle of motor vehicle
  53.61   ..PTO mounted directly on or engaging drive wheel to rotate
             therewith
  53.62   ..PTO constantly driven with wheel selectively driven
  53.7    .Drive to other machine by power take-off (PTO) at front
            end of vehicle
  53.8    .Other machine is vehicle accessory
  54.1    POWER
  54.2    .With spring powered motor
  55      .On lower running gear
  56      ..Rear axle and body
  57      ...Longitudinal shaft
  58      ..Frame
  59      ...Pivoted support on axle
  60      ...Electric
  61      ..Pivoted support on axle
  62      ..Rear axle
  63      .Motor moved by axle
  291     .Having specific motor-to-body-frame relationship
  292     ..Including change-speed gearing, or clutch, mounted in common
             with motor
  293     ...With member or mechanism for controlling gearing or clutch,
              and means for minimizing transfer of movement, caused by
              operation of motor, to member or mechanism
  294     ...With means enabling repositioning of motor and gearing or
              clutch
  295     ...With wheeled auxiliary frame, resiliently joined to body
              frame, for supporting motor and gearing or clutch
  296     ..Including means on body frame or motor for handling exhaust
  297     ..Having motor shaft parallel to rotational axis of driven
             wheel
  298     ..Including means enabling repositioning of motor
  299     ..Including auxiliary frame for motor and resilient means for
             connecting auxiliary frame to body frame
  300     ..Including means of nonsupporting nature for minimizing
             operation-induced movement of motor
  65.1    .Electric
  65.2    ..Combined with nonelectric drive means
  65.3    ..With means on vehicle for generating power for the
             electric motor
  65.4    ...Generating means is driven by a prime mover
  65.5    ..With motor in or moveable with wheel
  65.6    ..With gearing between electric motor and drive wheel
  65.7    ...Gearing is a changeable ratio gearing
  65.8    ..With electronic devices (logic gates, semi-conductors,
             vacuum tubes, etc.) in control circuit
  301     .Including traction motor of turbine type driven by fluid
            product of combustion
  302     .Including traction motor of kind driven by expansible fluid
            from source external of motor
  303     ..Gas is product of treatment of a volatile fluid (e.g., gas iss
             steam)
  304     ...With means to condense gas discharged from motor
  305     .Including traction motor of kind driven by noncompressible
            fluid received under pressure from a pump
  306     ..Vehicle includes another system operated by same fluid
  307     ..Having variable displacement type motor or pump
  308     ..Having separate motor for each driven, surface-engaging
             member
  309     .With means for handling motor exhaust
  310     .With means to generate steam for a propulsion purpose
  68.1    .With means to guide and/or control air for power plant
            cooling
  68.2    ..With further means to utilize power plant cooling air for
             other purposes
  68.3    .With means to guide and/or control combustion air for
            power plant
  68.4    .Radiators and condensers, mounting
  68.6    ..With protector for the radiator or condenser
  68.5    .Battery mountings and holders
  69.2    .Hoods
  69.21   ..Pivoted about horizontal axis extending transversely of
             vehicle (e.g., alligator type or front end pivot)
  69.22   ..With noise suppression means
  69.23   ...Noise suppression means prevents hood from vribrating
              (i.e., anti rattlers)
  69.24   ..With access openings having moveable or removeable
             closures
  69.25   ..Water deflectors
  69.3    .With means to increase idle speed of internal combustion
            engine to compensate for accessory load
  69.4    .With fuel supply for internal combustion engine
  69.5    ..Engine uses gaseous fuel
  69.6    .Vehicle has plural power plants
  69.1    .Underpans
  337     TRANSMISSION MECHANISM
  338     .Condition responsive (e.g., responsive to speed, load, etc.)
  339     .With temperature control, lubrication or sealing
  340     .With laterally movable wheel
  341     .Wheel drives parallel wheel
  342     .Tire directly driven
  343     ..With particular gear structure
  344     .Assembly feature
  345     .Traction aid
  346     .With protective guard or casing
  347     .Mechanical movement transmission
  348     .Final drive axle movable
  349     ..Rigid axle
  350     ...Belt or chain drive
  351     ....With tensioning means
  352     ...With lateral support between the differential or axle housing
              and the vehicle frame
  353     ...With sprung differential
  354     ....And differential support feature
  355     ....And final gear drive
  356     ...And final gear drive
  357     ..Belt or chain drive
  358     ..Swinging axle, single pivot
  359     ..With sprung differentiall
  360     ...And differential support feature
  361     ...And final gear drive
  362     ...And transverse leaf spring suspension
  363     ..And final gear drive
  364     .Variable speed or direction
  365     ..Plural
  366     ..Belt or chain
  367     ..Fluid drive
  368     ..Friction drive
  369     ..Planetary
  370     .With brake
  371     .Final gear drive at each of two parallel wheels
  372     ..Planetary
  373     ..Belt or chain
  374     .Gear transmission relationship to frame or axle
  375     ..Transmission is differential
  376     .Shaft relationship to frame or shaft
  377     .Transmission support
  378     ..Differential or axle housing
  379     ..Shaft
  380     ...With propeller shaft casing, (e.g., torque tube)
  381     ...Vibration damping
  382     ..Flexible support
  383     .With particular drive coupling
  384     ..Relative axial movement
  385     ..Drive connection to wheel
  76      COMPENSATING DEVICES
  314     WITH PLURAL FUEL TANKS
  315     MANUALLY ACTUATED CONTROLLING DEVICES
  316     .By other than hand or foot of operator
  317     .On mine car vehicle
  318     .On delivery-type vehicle
  319     .With rein means
  320     .With vehicle control extension
  321     .With plural control stations
  322     ..Side-by-side
  323     ..For single control means
  324     ..With tool or equipment control
  325     ..Braking controllable by passenger
  326     .With movable control station or seat position
  327     ..Movable cab
  328     ...Tilting
  329     ..Simultaneously movable seat and control
  330     ..Seat on seat portion movable to alternate positon
  331     ...With tool or equipment control
  332     .With tiller-type handle
  333     .Multiple vehicle functions controllable by single device
  334     .With adjustable operator engageable control
  335     .With fuel or air throttle control
  336     .With transmission control
  78      .Steering shaft
  79      STEERING GEAR
  131     .Steering by terrestrial guide
  132     .With fluid power assist
  133     ..With alternate emergency power means (e.g., pump, gearing
             etc.)
  134     ..Between articulated wheeled vehicle sections
  135     ...Combined with another steering modee
  136     ...Reciprocating power assist
  137     ....Including flexible power transmitting means
  138     ....Including interengaging gear means
  139     ....Plural working members
  140     ..Each wheel steerable
  141     ..With condition modulated steering
  142     ...Electrical control
  143     ...Speed condition only
  144     ..With swinging vehicle frame transversing axle
  145     ..Including flexible power transmitting means
  146     ..Steering column supported
  147     ...Including rack gear means
  148     ..With rack and pinion gearing intermediate steering shaft and
             power assist
  149     ..Having rotary working member
  150     ..Having flexible working member
  151     ..Steering linkage includes interengaging gear means
  152     ..With plural working members
  153     ...Working member movement traverses vehicle path
  154     ..Working member movement traverses vehicle path
  155     ...Moves separate rod for each wheel steering arm
  156     ....Via intermediate pivoted member
  157     .....With link member interconnecting pivoted member and rod
  158     ....Working member is moving cylinder
  159     ...Working member part engages wheel steering arm
  160     ...Working member part engages tie rod
  161     ..Movable working member engages wheel steering arm
  162     ..Movable working member is moving cylinder
  163     ..With linkage intermediate working member and wheel steering
             arm
  79.1    .With electric power assist
  79.3    .With mechanical power assist
  79.4    ..Swinging axle
  79.5    ..Truck
  84      DUST GUARDS
  89.1    BODIES
  89.11   .With passenger compartment having article receiving or
            removing means
  89.12   .Tractor and similar vehicle cabs
  89.13   .Movable cab or operator's station
  89.14   ..Tilting
  89.15   ...Via power or power enhancing means
  89.16   ..Overmotor cab
  89.17   .Movable body portion facilitating engine access
  89.18   ..Cab portion
  89.19   .Overmotor cab
  89.2    .With means for handling exhaust of a motor
  90      .Dashboards
  90.6    .Footboards and pedal guards
  311     FRAME
  312     .With structure adapted to receive or support a motor,
            change-speed gearing, or other power train element
  313     MISCELLANEOUS
  *       ******************************
  *       CROSS-REFERENCE ART COLLECTIONS
  *       ******************************
  900     ARGICULTURAL-TYPE TRACTORS
  901     DEVICES FOR TRAVERSING VERTICAL SURFACESS
  902     SHOCK OR VIBRATION ABSORBING OR TRANSMITTING MEANS BETWEEN WHEEL
           SUSPENSION AND MOTOR
  903     AIRSTREAM REACTIVE VEHICLE OR VEHICLE STRUCTURE
  904     TRACTION DOLLIES FOR AIRCRAFT (Cross Reference Art Collection
           created in companion project)
  905     AXLES
  906     ADJUSTABLE AXLES
  907     MOTORIZED WHEELCHAIRS
  908     MOTOR VEHICLES WITH SHORT WHEELBASE