854011 Cathode-ray Tubes for Colour Television Picture
854012 Cathode-ray Tubes for Black and White or Other Monochrome Television Picture
854020 Television Camera Tubes; Image Converters and Intensifiers; Photo-cathode Tubes
854030 Other Cathode-ray Tubes
854041 Magnetrons
854042 Klystrons
854049 Travelling Wave Tubes, Carcinotrons, Other Microwave Tubes
854081 Receiver or Amplifier Valves and Tubes
854089 Other Thermionic, Cold Cathode or Photo-cathode Tubes
854091 Parts of Cathode-ray Tubes
854099 Parts of Thermionic, Cold Cathode or Photo
