DIFF Main Group
B21D 51/00 Making hollow objects (from thick-walled or non uniform tubes B21K21/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Making hollow objects
CPC: Making hollow objects (from thick-walled or non uniform tubes B21K21/00)
Full Title
Full titles differ between systems:
IPC:
Making hollow objects
CPC:
Making hollow objects (from thick-walled or non uniform tubes B21K21/00)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B21D 51/16 characterised by the use of the objects (making heat exchangers B21D53/02) IPC+CPC Available in IPC and CPC