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)

Child Classifications

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• H01J 31/02 having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
• H01J 31/08 having a screen on or from which an image or pattern is formed, picked up, converted, or stored