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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
B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
B21K3/04—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like blades, e.g. for turbines; Upsetting of blade roots
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FR611074D1925-05-151925-05-15Hélice métallique aérienne et son procédé de fabrication
ExpiredFR611074A
(fr)