A method and corresponding apparatus accurately and efficiently fasten roofing materials to a roof. A first stroke of a piston both separates a single roofing screw from a roofing screw magazine and delivers it to a premounting position and separates a metal bracket from a metal bracket magazine and...http://www.google.fr/patents/US4870750?utm_source=gb-gplus-shareBrevet US4870750 - Device for machine-fastening roofing materials to roofs
Device for machine-fastening roofing materials to roofs
