IPC Subgroup
H01J 21/16 with external electrostatic control means and with or without internal control electrodes
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with a single discharge path > having electrostatic control means only > with external electrostatic control means and with or without internal control electrodes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS