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| выпрямительная ртутная лампа; ртутная трубка | |||
| ртутный вентиль; ртутная лампа | |||
| парортутная лампа; парортутная трубка | |||
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Quecksilberdampfröhre : 4 phrases in 1 subject |
| Electronics | 4 |
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