CPC Subgroup Additional Only
H01J 2201/28 Heaters for thermionic cathodes
Full Title
Electrodes common to discharge tubes > Heaters for thermionic cathodes
3 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- H01J 2201/2803 Characterised by the shape or size
- H01J 2201/2889 Characterised by material
- H01J 2201/2892 Coatings