CPC Subgroup
F21V 11/08 using diaphragms containing one or more apertures
Full Title
Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) > using diaphragms containing one or more apertures
3 direct subcodes
Child Classifications
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- F21V 11/10 of iris type
- F21V 11/12 of slot type
- F21V 11/14 with many small apertures