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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D28/00—Shaping by press-cutting; Perforating
B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
B21D28/06—Making more than one part out of the same blank; Scrapless working
B21D28/08—Zig-zag sequence working
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FR513426A1919-09-221919-09-22Dispositif automatique d'amenée des matières pour presses, découpeuses, poinconneuses et machines à repousser
ExpiredFR513426A
(fr)