 |
| |||
| directly heated cathode; directly heated cathode filament; filament-type cathode; filamentary cathode; filament | |||
| filament: 6 do fraz, 2 tematyki |
| Elektronika | 4 |
| Przemysł | 2 |
|
| |||
| directly heated cathode; directly heated cathode filament; filament-type cathode; filamentary cathode; filament | |||
| filament: 6 do fraz, 2 tematyki |
| Elektronika | 4 |
| Przemysł | 2 |