US PATENT SUBCLASS 411 / 482
.~ Plural axially aligned 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}
482.~ Plural axially aligned heads

DEFINITION

Classification: 411/482

Plural axially aligned heads:

(under subclass 439) Subject matter wherein the impact receiving surface comprise multiple receiving surfaces attached end-to-end concentric to the fastener axis.