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17 Jul 1921 Jahr - Электрет

Beschreibung:

диэлектрик, помогающий в работе микрофона

Zugefügt zum Band der Zeit:

История создания микрофона

ByЮля Мухамеджанова

23 Okt 2018

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0

409

Datum:

17 Jul 1921 Jahr

Jetzt

~ 104 years ago

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