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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Class Number: 278 Class Title: LAND VEHICLES: ANIMAL DRAFT APPLIANCES Subclass Subclass Number Title 1 MISCELLANEOUS 2 LOAD STARTERS 2.1 STREET CAR * DRAFT EQUALIZERS 3 .Horse longitudinally aligned 4 ..Two abreast 5 .Horses abreast 6 ..Five-horse type 7 ...With pole or poles 8 ..Four-horse type 9 ...With pole or poles 10 ....Offset pole 11 .....Three-against-one pull 12 .....Two-against-two pull 13 ......Lateral evener connection 14 ..Three-horse type 15 ...With pole or poles 16 ....With intermediate evener 17 .....Offset 18 .Two-horse type 19 ..Leverage adjustment 20 ...Automatic 21 HORSE DETACHERS 22 .Automatic 23 .Combined brake 24 .Traces from singletree 25 ..Traces positively moved 26 ..Movable trace-eye-engaging element 27 ...Pivoted 28 ...Sliding pin or rod 29 .Thills or poles from vehicle 30 ..Retracting axle-clip bolts 31 .Doubletree from pole 32 .Singletree from thill or evener 33 POLES AND THILLS 34 .Plural 35 .Special-purpose attachments 36 .Poles 37 ..Agricultural-implement type 38 ..The pole body 39 ..Selective positioned 40 ..Slip tongue 41 ..Axle attached 42 ...Width adjustment 43 ..Axle hounds attached 44 .Thills 45 ..Two-wheeled vehicles 46 ..Offset draft 47 ...Selective direct 48 ..Sectional 49 ..Joints and braces 50 .Tipss 51 ..Safety neck-yoke retainers 52 THILL COUPLINGS 53 .Resilient 54 .Safety attachments 55 .Plural 56 .Special-position release 57 ..L-head type 58 ..T-head type 59 ..D-head type 60 .Removable transverse pin or bolt 61 ..Antirattling 62 ...With special pin retainers 63 ...Resilient 64 ....Adjustable 65 ..Special pin retainers 66 .Opposed lug engaging or carrying jaws 67 .L-head type 68 .T-head type 69 ..Cooperating hooks 70 ...Retainers 71 ....Spring 72 .D-head type 73 ..Cooperating hook 74 ...Retainers 75 ....Pivoted 76 ....Spring 77 ..Plural-part eye 78 ...Pivoted jaws 79 ....Grapple type 80 .Ball and socket 81 THILL-SUPPORTS 82 .Plural position 83 .Spring latches 84 .Spring 85 .Separate props 86 POLE SUPPORTS 87 .Ground-engaging props 88 .Spring 89 ..Coil 90 WHIFFLETREES 91 .Resilient 92 .Metallic 93 ..Trussed 94 .Trussed 95 .Connections 96 ..Link or clevis 96.1 ...Resilient 96.2 ...Adjustable draft line 96.3 ....Horizontally 97 ..Resilient 98 ...To pole or thills 99 ..To pole or thills 100 ...Pivot bolt 101 ....Offset pivot 102 .Trace and whiffletree connections 103 ..Resilient 104 ..Clamp 105 ..Trace-eye-engaging head or endd 106 ...Loop retainers 107 ...Hook retainers 108 ...Spring-detent retainers 109 ...Pivoted button or lug retainers 110 ...Rotatable-button retainers 111 ..Hooks 112 ...Trace retaining 113 ....Movable keeper 114 .....Snap-hook type 115 ....Special-position release 116 .....Opposed lapping hooks 117 ...Whiffletree fastenings 118 TRACE AND THILL OR POLE CONNECTIONS 119 NECK YOKES 120 .End construction 121 .Pole couplings 122 ..Modified pole and yoke (center) 123 ...Permanently attached 124 ..With safety devices 125 ..Leather eye or ring 126 HOLDBACKS 127 .Harness attached 128 ..Breech strap 129 ...Adjustable 130 ...Automatic release