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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
B21K21/00—Making hollow articles not covered by a single preceding sub-group
B21K21/06—Shaping thick-walled hollow articles, e.g. projectiles
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FR1057414D1952-05-271952-05-27Procédé pour l'obtention par estampage d'ébauches destinées à la fabrication dedouilles de projectile
ExpiredFR1057414A
(fr)
Procédé pour la fabrication d'un soufflet de communication pour véhicules, et plus particulièrement pour véhicules de chemin de fer, et soufflet de communication obtenu par ce procédé