DIFF Subgroup
C30B 33/08 Etching
Introduced: January 1990
Full Title
Full titles differ between systems:
IPC:
After-treatment of single crystals or homogeneous polycrystalline material with defined structure > Etching
CPC:
After-treatment of single crystals or homogeneous polycrystalline material with defined structure (C30B31/00 takes precedence) > Etching
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
IPC defines codes here since 1990.
Child Classifications
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