A powder-actuated fastener-driving tool of the type disclosed in U.S. Pat. No. 4,655,380, modified to include a safety system for preventing accidental discharge of the tool, a fastener storage and feed assembly, and a simpler firing pin assembly. The safety system prevents discharge of a fastener from...http://www.google.fr/patents/US4821938?utm_source=gb-gplus-shareBrevet US4821938 - Powder-actuated fastener driving tool
