DIFF Subgroup
B23F 9/10 with a face-mill
Introduced: September 1968
Full Title
Making gears having teeth curved in their longitudinal direction > by milling, e.g. with helicoidal hob > with a face-mill
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 1974.
Child Classifications
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