(under subclass 356) Subject matter provided with means having a sheet metal or metal strip section having a sharp projection stamped, cut, or formed thereon capable of penetrating structure-to-be-secured(*).
SEE OR SEARCH THIS CLASS, SUBCLASS:
377, for hook and penetrating prong fasteners.
380, for combined diverse multipart fasteners, one of which is a penetrating prong.
690, for separable-fasteners(*) provided with deformable and penetrable mounting means.
