US PATENT SUBCLASS 411 / 478
.~.~ Folded or twisted

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

439  DF  IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13}
477  DF  .~ Of sheet metal {2}
478.~.~ Folded or twisted

DEFINITION

Classification: 411/478

Folded or twisted:

(under subclass 477) Subject matter wherein the fastener is subjected either to bending or torsional forces.