DIFF Main Group
C21D 3/00 Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings C21D1/72)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Diffusion processes for extraction of non-metals; Furnaces therefor
CPC: Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings C21D1/72)
Full Title
Full titles differ between systems:
IPC:
Diffusion processes for extraction of non-metals; Furnaces therefor
CPC:
Diffusion processes for extraction of non-metals; Furnaces therefor (local protective coatings C21D1/72)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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