US PATENT SUBCLASS 411 / 923
NAIL, SPIKE OR TACK HAVING SPECIFIC HEAD STRUCTURE

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

923NAIL, SPIKE OR TACK HAVING SPECIFIC HEAD STRUCTURE

DEFINITION

Classification: 411/923

NAIL, SPIKE OR TACK HAVING SPECIFIC HEAD STRUCTURE:

Art collection of nail, spike or tack fasteners designed to be driven by repeated blows or by nailing machines and laterally displacing the material into which they are force to be retained by friction, clenching, or additionally locking means and in which significance is attributed to the head structure of a nail, spike, or tack fastener.