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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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FR13496D1909-12-161910-12-01Procédé pour faconner et travailler les pans latéraux des écrous, tetes de vis, de boulons et de crampons
ExpiredFR13496E
(fr)