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光 ひかりファイバ伝送 でんそう技術 ぎじゅつだった
hikarifaibadensōgijutsudatta

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Noun
, 
Da Copula

The past form of 光ファイバ伝送技術

1. Optical fiber transmission technology was.

Past/Perfective
, 
Computing

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光ファイバ伝送技術だった

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