F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F21
LIGHTING
F21
LIGHTING
F21V
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V5/00
Refractors for light sources
F21V5/00
Refractors for light sources
F21V5/04
of lens shape
F21V5/04
of lens shape
F21V5/041
Ball lenses
F21V5/041
Ball lenses