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セシウム原子 げんし時計 とけいでした
seshiumugenshitokeideshita

敬
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Noun
, 
Desu Copula

The polite past form of セシウム原子時計

1. Cesium atomic clock was.

Past/Perfective
, 
Polite

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セシウム原子時計でした

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