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PCE
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DIFF Subgroup
G02B 9/50

both + components being meniscus

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or – > having four components only > arranged + –– + > both + components being meniscus

CPC:

Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - (G02B15/00 takes precedence) > having four components only > arranged + -- + > both + components being meniscus

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