US PATENT SUBCLASS 168 / 42
.~.~.~ Screw threaded

Current as of: June, 1999
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168 /   HD   FARRIERY

29  DF  CALKS {2}
31  DF  .~ Removable {8}
*  DD  .~.~ Tenoned {5}
42.~.~.~ Screw threaded

DEFINITION

Classification: 168/42

A tenon on the calk or a lug on the shoe is screw-threaded and the parts are screwed together. Various means are employed to prevent the parts from unscrewing.