Abstract: An anchor nail for use with gypsum and other cementitious or composite materials used in roofing which includes a tapered tubular shank having openings therein through which ends of an insert wire staple are deflected to provide an anchoring for the nail within the material and wherein the legs of the staple are formed so as to prevent fastener withdrawal.

Abstract: A silencer for relatively low horsepower combustion engines is constructed with two separate sections in series through which exhaust gases pass. The upstream section has two concentric perforated tubes within an imperforate jacket with exhaust openings from the tubes discharging into a vestibule. From the vestibule gases are directed in a circumferential path as they enter a second series of concentric perforated tubes within the jacket, the gases being passed first to a chamber between the jacket and the outermost tube and from there through perforations in the walls of the tubes to an exhaust outlet port.