US PATENT SUBCLASS 81 / 459
.~.~ Inserted portion having threaded periphery

Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
436  DF  .~ Having work engaging and force exerting portion inserted into cavity (e.g., allen wrench, screwdriver) {10}
459.~.~ Inserted portion having threaded periphery

DEFINITION

Classification: 81/459

Inserted portion having threaded periphery:

(under subclass 436) Work-engaging and strain-exerting portions having a threaded periphery which is intended to cooperate with the contour of the cavity.