US PATENT SUBCLASS 411 / 473
.~.~ Having distinct driving head

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.~.~ Having distinct driving head {1}
474  DF  .~.~.~> Plural heads

DEFINITION

Classification: 411/473

Having distinct driving head:

(under subclass 457) Subject matter wherein significance is attributed to the impact receiving surface of the fastener.