US PATENT SUBCLASS 411 / 474
.~.~.~ Plural heads

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}
457  DF  .~ Multiple prong, e.g., nailing plate, staple, etc. {8}
473  DF  .~.~ Having distinct driving head {1}
474.~.~.~ Plural heads

DEFINITION

Classification: 411/474

Plural heads:

(under subclass 473) Subject matter wherein the fastener is provided with more than one impact receiving surface.