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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
B21H3/00—Making helical bodies or bodies having parts of helical shape
B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
B21H3/04—Making by means of profiled-rolls or die rolls
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FR913704D1944-09-081945-08-25Machines pour laminer des filets de vis, des rainures annulaires, des dentelures, ou analogues sur des pièces
ExpiredFR913704A
(fr)