CPC Subgroup
H01J 31/20 for displaying images or patterns in two or more colours
Full Title
Cathode ray tubes; Electron beam tubes (H01J25/00, H01J33/00, H01J35/00, H01J37/00 take precedence; details of cathode ray tubes or of electron beam tubes H01J29/00) > having a screen on or from which an image or pattern is formed, picked up, converted, or stored > Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes > for displaying images or patterns in two or more colours
2 direct subcodes
Child Classifications
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