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17 jul 1921 año - Электрет

Descripción:

диэлектрик, помогающий в работе микрофона

Añadido al timeline:

История создания микрофона

ByЮля Мухамеджанова

23 oct 2018

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409

fecha:

17 jul 1921 año

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~ 104 years ago

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