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二 に極 きょく真空 しんくう管 かんでした
nikyoku shinkūkandeshita

敬
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Noun
, 
Desu Copula

The polite past form of 二極真空管

1. It was a vacuum tube.; It used to be a vacuum tube.

Past/Perfective
, 
Polite

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二極真空管でした

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