(under subclass 76) Subject matter having a cathode-ray tube.
(1) Note. The cathode-ray tube may be an indicator as, for example, a cathode ray oscilloscope or a "magic eye" tube, or the cathode-ray tube may be a control tube of some type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
88, for this subject matter utilized to measure phase displacement between two voltages.
SEE OR SEARCH CLASS
313, Electric Lamp and Discharge Devices, 364+, for cathode-ray tubes, per se.
315, Electric Lamp and Discharge Devices: Systems,
1+, for cathode- ray tubes circuits of general application. Note that Class 315 includes, among its cathode-ray tube systems, those systems in which an unknown voltage is applied to the deflecting means of the cathode-ray tube so that the unknown voltage may be observed. The system is not excluded from Class 315 unless some means is claimed to enable the desired information to be derived other than merely observing the trace of the ray on an unchartered luminous screen.
