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PCE
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DIFF Subgroup
C21D 1/613

Gases; Liquefied or solidified normally gaseous material

Introduced: January 1980

Full Title

General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > characterised by the quenching agents > Gases; Liquefied or solidified normally gaseous material

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