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Triode
| Heptode
| Triode | |
| phys. | three-electrode tube; three-electrode valve |
| tech. | triode; triode valve |
| Heptode | |
| tech. | heptodical tube |
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| three-electrode tube; three-electrode valve | |||
| triode; triode valve | |||
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| triods | |||
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Triode : 28 phrases in 3 subjects |
| Antennas and waveguides | 12 | Electronics | 1 | Technology | 15 |