A method and apparatus for acting on angle irons or the like. A vertical stack of angle irons is provided and the angle irons are fed one at a time to a punching position. At the punching position a hole of selected size is punched in the angle iron, and the angle iron is fed from the punching position...http://www.google.fr/patents/US4255993?utm_source=gb-gplus-shareBrevet US4255993 - Angle iron cutting
