DIFF Subgroup
G02B 3/06 with cylindrical or toric faces
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Simple or compound lenses > with non-spherical faces > with cylindrical or toric faces
CPC:
Simple or compound lenses > with non-spherical faces (G02B3/10 takes precedence) > with cylindrical or toric faces
No child classifications to compare. This is a leaf node in both IPC and CPC.