IPC Definitions - January 01, 2012
B21D 26/049 - Definition
This group covers:
Devices and methods for deforming metal tubular bodies having a bottom, i.e. a closed end, by applying fluid pressure.
Special rules of classification
When the invention is characterized by the shape of the bodies to be deformed in combination with a particular material feature of the bodies to be deformed, the invention shall also be classified in B21D 26/053 and subgroups thereof.