- Cathode ray tubes, including rebuilt (3)
- Picture tube reprocessing (2)
- Television tubes (2)
- Transmittal, industrial and special purpose electron tubes (2)
- Electron beam (beta ray) generator tubes (2)
- Electron tubes, industrial (1)
- Electron tubes, nsk (4)
- Electronic tube parts, except glass blanks (3)
- Light sensing and emitting tubes (1)
- Photomultiplier tubes (1)
- Traveling wave tubes (3)
- Tubes for operating above the X-ray spectrum (1)
- Vacuum tubes (6)
