Perforating, i.e. punching holes

Introduced: September 1968

Full Title

Shaping by press-cutting; Perforating > Perforating, i.e. punching holes

Of 8 combined children, 6 exist in both systems.

2 codes are CPC-only extensions.

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B21D 28/243 CPC only CPC only
B21D 28/246 CPC only CPC only
B21D 28/26 in sheets or flat parts +1 CPC IPC+CPC Available in IPC and CPC
B21D 28/28 in tubes or other hollow bodies +1 CPC IPC+CPC Available in IPC and CPC
B21D 28/30 in annular parts, e.g. rims IPC+CPC Available in IPC and CPC
B21D 28/32 in other articles of special shape +1 CPC IPC+CPC Available in IPC and CPC
B21D 28/34 Perforating tools; Die holders +2 CPC IPC+CPC Available in IPC and CPC
B21D 28/36 using rotatable work or tool holders IPC+CPC Available in IPC and CPC