DIFF Subgroup
B21K 21/12 Shaping end portions of hollow articles
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Making hollow articles not covered by any single one of groups > Shaping end portions of hollow articles
CPC:
Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00) > Shaping end portions of hollow articles
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
Child Classifications
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- B21K 21/14 closed or substantially-closed ends, e.g. cartridge bottoms IPC+CPC Available in IPC and CPC