DIFF Subgroup
C03C 13/048 Full Title
Fibre or filament compositions (manufacture of fibres or filaments C03B37/00) > Fibre optics, e.g. core and clad fibre compositions (light guides G02B6/00)
C03C 13/048 Fibre or filament compositions (manufacture of fibres or filaments C03B37/00) > Fibre optics, e.g. core and clad fibre compositions (light guides G02B6/00)