by purification

Full Title

Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass > Treating air flowing to refrigeration compartments > by purification

Of 5 combined children, 0 exist in both systems.

5 codes are CPC-only extensions.

Note: 5 CPC extensions are marked as secondary classification only.

This code exists only in CPC.

Diff view requires codes present in both systems.

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