US PATENT SUBCLASS 411 / 409
.~.~ Wing structure

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

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
402  DF  .~ Head driving structure {4}
409.~.~ Wing structure

DEFINITION

Classification: 411/409

Wing structure:

(under subclass 402) Subject matter wherein the head is provided with a radially extending generally flat gripping section.

(1) Note. The heads of this subclass usually have two gripping sections which are generally designed to be engaged by the fingers of the user.