DIFF Subgroup
F21V 3/061 Full Title
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 > characterised by the material
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.