Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B21
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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B21C
MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
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37/00
Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
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B21C37/06
of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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B21C37/15
Making tubes of special shape; Making; tube; fittings
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B21C37/155
Making tubes with non-circular section
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