Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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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 METAL
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B21D51/16
characterised by the use of the objects
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B21D51/26
cans or tins; Closing same in a permanent manner
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B21D51/2646
Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged
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