CPC Subgroup
G02B 27/02 Viewing or reading apparatus (stereoscopic systems G02B30/00)
Full Title
Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 > Viewing or reading apparatus (stereoscopic systems G02B30/00)
6 direct subcodes
Child Classifications
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- G02B 27/04 having collapsible parts
- G02B 27/06 with moving picture effect
- G02B 27/08 Kaleidoscopes