DIFF Main Group Additional Only
G02B 2207/00 Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
Of 11 combined children, 0 exist in both systems.
11 codes are CPC-only extensions.
Note: 11 CPC extensions are marked as secondary classification only.