US PATENT SUBCLASS 411 / 534
.~ Including antifriction means

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

531  DF  WASHER STRUCTURE {11}
534.~ Including antifriction means

DEFINITION

Classification: 411/534

Including antifriction means:

(under subclass 531) Subject matter wherein the element includes means adapted to reduce the resistance to relative rotary motion between two parts of an assembly in which the element is being used.