DIFF Subgroup
F21V 11/186 Full Title
Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) > using sheets without apertures, e.g. fixed > movable, e.g. flaps, slides
F21V 11/186 Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) > using sheets without apertures, e.g. fixed > movable, e.g. flaps, slides