CPC Subgroup
F21S 13/14 Lighting systems
Full Title
Non-electric lighting devices or systems employing a point-like light source; Non-electric lighting devices or systems employing a light source of unspecified shape > Lighting systems
F21S 13/14 Non-electric lighting devices or systems employing a point-like light source; Non-electric lighting devices or systems employing a light source of unspecified shape > Lighting systems