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有機 ゆうき発光 はっこうダイオードだった
yūkihakkōdaiōdodatta

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Noun
, 
Da Copula

The past form of 有機発光ダイオード

1. Was an organic light-emitting diode.

Past/Perfective
, 
Electronics

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有機発光ダイオードだった

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