Patents
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B21 - Mechanical metal-working without essentially removing material; Punching metal
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B21D - Working or processing of sheet metal or metal tubes, rods or profiles without essentially removing material; Punching
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B21D 49 - Sheathing or stiffening objects
Patents for B21D 49 - Sheathing or stiffening objects (201)
07/1976
07/27/1976
US3971688
Method of making an elongate, transversely reinforced metal sheet
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