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PCE
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DIFF Subgroup
G02B 27/40

Optical focusing aids

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Optical systems or apparatus not provided for by any of the groups , > Optical focusing aids

CPC:

Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 > Optical focusing aids

No child classifications to compare. This is a leaf node in both IPC and CPC.