CPC Subgroup
G09G 1/20 using multi-beam tubes (G09G1/26, G09G1/28 take precedence)
Full Title
Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; (cathode-ray oscilloscopes G01R13/20; ) > using multi-beam tubes (G09G1/26, G09G1/28 take precedence)