DIFF Subgroup
B21J 7/20 Drives for hammers; Transmission means therefor
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Hammers; Forging machines with hammers or die jaws acting by impact > Drives for hammers; Transmission means therefor
CPC:
Hammers; Forging machines with hammers or die jaws acting by impact (hand hammers B25D; electrical features in section H) > Drives for hammers; Transmission means therefor
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
Child Classifications
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- B21J 7/46 Control devices specially adapted to forging hammers, not restricted to one of the preceding subgroups IPC+CPC Available in IPC and CPC