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PCE
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DIFF Subgroup
C21D 9/22

for drills; for milling cutters; for machine cutting tools

Introduced: September 1968

Full Title

Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor > for drills; for milling cutters; for machine cutting tools

No child classifications to compare. This is a leaf node in both IPC and CPC.