US PATENT SUBCLASS 12 / 31.6
.~.~ Spring heel

Current as of: June, 1999
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12 /   HD   BOOT AND SHOE MAKING

17 R  DF  SOLE MACHINES {23}
31.5  DF  .~ Heel-seal forming {1}
31.6.~.~ Spring heel

DEFINITION

Classification: 12/31.6

(under subclass 31.5) Machines in which means are provided to prepare a sole to receive a spring heel.

(1) Note. A spring heel is a heel inserted between two soles, one of which, usually the tread or outermost sole, is bent (sprung) to provide a recess for the heel between the two soles.