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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C23/00—Extruding metal; Impact extrusion
B21C23/22—Making metal-coated products; Making products from two or more metals
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FR641899D1927-03-121927-03-12Procédé de fabrication à la presse des corps creux et des tubes sans soudure en particulier
ExpiredFR641899A
(fr)
Presse à étirer verticale pour l'étirage de corps creux de dimensions relativement grandes, en particulier de corps de chaudières à haute pression et analogues