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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
B21K1/00—Making machine elements
B21K1/64—Making machine elements nuts
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FR449936A1911-11-241912-10-28Poincons pour matrices destinées à dresser et à lisser les surfaces latérales d'écrous estampés et analogues
ExpiredFR449936A
(fr)