DIFF Subgroup
F21V 3/04 characterised by materials, surface treatments or coatings
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Globes; Bowls; Cover glasses > characterised by materials, surface treatments or coatings
CPC:
Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506) > characterised by materials, surface treatments or coatings
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
IPC defines codes here since 2018.
Child Classifications
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