US PATENT SUBCLASS 278 / 71
.~.~.~.~ Spring

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

52  DF  THILL COUPLINGS {10}
68  DF  .~ T-head type {1}
69  DF  .~.~ Cooperating hooks {1}
70  DF  .~.~.~ Retainers {1}
71.~.~.~.~ Spring

DEFINITION

Classification: 278/71

Spring:

(under subclass 70) Subject matter wherein such retaining means is in the form of a spring.