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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
B21D28/24—Perforating, i.e. punching holes
B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
B21D28/265—Perforating, i.e. punching holes in sheets or flat parts with relative movement of sheet and tools enabling the punching of holes in predetermined locations of the sheet, e.g. holes punching with template
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FR467462D1913-08-061914-01-19Perfectionnements aux appareils et machines pour le poinconnage du métal et autres opérations analogues
ExpiredFR467462A
(fr)