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B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21B—ROLLING OF METAL
B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels
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FR375447D1907-03-071907-03-07
Apparatus for the alternative working of tubes on oblique rolling mills
ExpiredFR375447A
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