CPC Subgroup
C21D 1/62 Quenching devices
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Quenching devices
3 direct subcodes
Child Classifications
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- C21D 1/63 for bath quenching
- C21D 1/667 for spray quenching
- C21D 1/673 for die quenching