US PATENT SUBCLASS 411 / 372.5
.~ Cap over the 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}
372.5.~ Cap over the head {2}
372.6  DD  .~.~> Having attaching or retaining means
373  DF  .~.~> Attachable cap structure {4}