| |||
| hot-cathode gas-filled tube | |||
| thermionic relay; hot-cathode gas filled valve | |||
| thyratron; hot cathode gas-filled tube; hot cathode gas filled tube | |||
|
Stromtor : 1 phrase in 1 subject |
| Environment | 1 |
| |||
| hot-cathode gas-filled tube | |||
| thermionic relay; hot-cathode gas filled valve | |||
| thyratron; hot cathode gas-filled tube; hot cathode gas filled tube | |||
|
Stromtor : 1 phrase in 1 subject |
| Environment | 1 |