DIFF Main Group
G02B 17/00 Systems with reflecting surfaces, with or without refracting elements
Introduced: September 1968
CPC subdivides this area 3x more granularly than IPC with 4 additional codes.
4 codes are CPC-only extensions.
Child Classifications
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- G02B 17/02 Catoptric systems, e.g. image erecting and reversing system +2 CPC IPC+CPC Available in IPC and CPC