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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28/00
Shaping by press-cutting; Perforating
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B21D28/24
Perforating, i.e. punching holes
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B21D28/32
in other articles of special shape
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B21D28/325
using cam or wedge mechanisms, e.g. aerial cams
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