US PATENT SUBCLASS 411 / 371.1
.~ Sealing-type washer compressed by head


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

337  DF  HEADED FASTENER ELEMENT WITH NUT, WASHER, SECURING MEANS OR CAP {12}
371.1.~ Sealing-type washer compressed by head