US PATENT SUBCLASS 278 / 73
.~.~ Cooperating hook

Current as of: June, 1999
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278 /   HD   LAND VEHICLES: ANIMAL DRAFT APPLIANCES

52  DF  THILL COUPLINGS {10}
72  DF  .~ D-head type {2}
73.~.~ Cooperating hook {1}
74  DF  .~.~.~> Retainers {2}

DEFINITION

Classification: 278/73

Cooperating hook:

(under subclass 72) Subject matter wherein the transverse member of the "D" is engaged by a hook.