US PATENT SUBCLASS 411 / 444
.~.~ Laterally attached only at head or bridge

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}
442  DF  .~ Plural attached fasteners {3}
444.~.~ Laterally attached only at head or bridge

DEFINITION

Classification: 411/444

(under subclass 442) Laterally attached only at head or bridge: Subject matter wherein the fasteners are connected together at ends thereof which are adapted to receive impact during driving.