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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
B21D28/34—Perforating tools; Die holders
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FR529736D1921-01-111921-01-11Perfectionnement aux tas à gradins pour le montage d'outils tels qu'emporte-pièces, poinçons et analogues
ExpiredFR529736A
(fr)
Dispositif pour produire des oscillations compensées et réglables pouvant être appliquées à des vibro-cribles, vibro-sélecteurs, vibrotransporteurs et machines analogues