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 | .~ Plural attached fasteners {3} | |
443 | DF | .~.~> Integral strip |
444 | DF | .~.~> Laterally attached only at head or bridge |
445 | DF | .~.~> Attached end-to-end |