IPC Subgroup
H01J 21/18 having magnetic control means; having both magnetic and electrostatic control means
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with a single discharge path > having magnetic control means; having both magnetic and electrostatic control means
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS