DIFF Subgroup
F21V 11/18 movable, e.g. flaps, slides
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Screens not covered by groups , , or > using sheets without apertures, e.g. fixed > movable, e.g. flaps, slides
CPC:
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
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.
Child Classifications
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