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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
B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
B21D11/14—Twisting
B21D11/15—Reinforcing rods for concrete
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FR1044122D1950-10-251951-10-24Procédé de fabrication d'armatures rectilignes torsadees pour béton et machine destinée à l'exécution de ce procédé
ExpiredFR1044122A
(fr)
Procédé de fabrication de coffrages métalliques pour plafonds nervurés en bétonarmé, éléments de coffrages métalliques et procédé de fabrication de plafonds en caissons à l'aide de coffrages métalliques