IPC Subgroup
H01J 37/304 Controlling tubes by information coming from the objects, e.g. correction signals
Introduced: January 1980
Last revised: January 2006
Full Title
Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof > Electron-beam or ion-beam tubes for localised treatment of objects > Controlling tubes by information coming from the objects, e.g. correction signals
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS