Illumination of dials or hands

Official title: Illumination of dials or hands {(dials in general G04B19/06; moving indicating means with numbers or hands, in general G04B19/20; arrangements for indicating different local apparent times by means of a globe illuminated from inside G04B19/22; continuous indication of the time by non-electric light sources G04B25/00, e.g. by electric lamps G04C17/02; illumination by electric lamps which function at fixed times or periodically G04C19/02; illuminated panels G09F13/00)}

G04B19/30 (Illumination of dials or hands) appears on 223 US grants and 173 published applications in this corpus.