- Cathode ray tubes, including rebuilt (15)
- Picture tube reprocessing (4)
- Television tubes (13)
- Transmittal, industrial and special purpose electron tubes (8)
- Electron beam (beta ray) generator tubes (7)
- Electron tubes, industrial (2)
- Electron tubes, nsk (8)
- Electron tubes, transmitting (1)
- Electronic tube parts, except glass blanks (15)
- Gas or vapor tubes (2)
- Light sensing and emitting tubes (3)
- Magnetron tubes (1)
- Photomultiplier tubes (2)
- Traveling wave tubes (3)
- Tubes for operating above the X-ray spectrum (5)
- Vacuum tubes (17)
