DIFF Subgroup
B21K 21/06 Shaping thick-walled hollow articles, e.g. projectiles
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Making hollow articles not covered by any single one of groups > Shaping thick-walled hollow articles, e.g. projectiles
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 thick-walled hollow articles, e.g. projectiles
No child classifications to compare. This is a leaf node in both IPC and CPC.