DIFF Subgroup
F21V 11/14 with many small apertures
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Screens not covered by groups , , or > using diaphragms containing one or more apertures > with many small apertures
CPC:
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 > with many small apertures
No child classifications to compare. This is a leaf node in both IPC and CPC.