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CPC Subgroup
B23C 3/32

Milling helical grooves, e.g. in making twist-drills

Full Title

Milling particular work; Special milling operations; Machines therefor (milling gear-teeth B23F, ) > Grooving workpieces (tread-cutting by milling B23G1/32) > Milling helical grooves, e.g. in making twist-drills