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