DIFF Subgroup
G02C 7/165 Full Title
Optical parts (characterised by the material G02B1/00) > Shades; shields; Obturators, e.g. with pinhole, with slot
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G02C 7/165 Optical parts (characterised by the material G02B1/00) > Shades; shields; Obturators, e.g. with pinhole, with slot