DIFF Subgroup
C21D 1/78 Combined heat-treatments not provided for above
Introduced: September 1968
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Combined heat-treatments not provided for above
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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