DIFF Subgroup
C21D 1/06 Surface hardening
Introduced: September 1968
Full Title
General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Surface hardening
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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- C21D 1/09 by direct application of electrical or wave energy; by particle radiation since 1980 IPC+CPC Available in IPC and CPC