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unidyne | |||
dynatron; tetrode | |||
screen-grid tube | |||
screen grid tube | |||
quadrode |
四极 管 : 50 phrases in 10 subjects |
Air defense | 7 |
Electronics | 4 |
General | 19 |
Metallurgy | 3 |
Oil / petroleum | 1 |
Radio | 3 |
Semiconductors | 1 |
Space | 5 |
Technology | 6 |
Telecommunications | 1 |