DIFF Main Group
G03B 11/00 Filters or other obturators specially adapted for photographic purposes
Introduced: September 1968
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G03B 11/04 Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids +4 CPC IPC+CPC Available in IPC and CPC