DIFF Subgroup
B23F 9/08 by milling, e.g. with helicoidal hob
Introduced: September 1968
Full Title
Making gears having teeth curved in their longitudinal direction > by milling, e.g. with helicoidal hob
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
Child Classifications
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