EXTREME DEVICES

Cathode ray tubes; extreme cathode ray tubes; extreme cold cathode ray tubes; electron gun assemblies; cold cathode electron gun assemblies; cathode ray tube; cathode ray tube having a cold cathode electron gun assembly; glass projection tubes for scientific purposes; light emitting diodes, light emitting triodes, thyristors, electric switches, electrical temperature sensors and microwave sources, namely, gyrotrons, magnetrons, traveling wave tubes, klystrons; light emitting diodes, light emitting triodes, thyristors, electrical temperature sensors and electrical temperature optical detectors