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17 jul 1921 ano - Электрет

Descrição:

диэлектрик, помогающий в работе микрофона

Adicionado na linha do tempo:

История создания микрофона

ByЮля Мухамеджанова

23 out 2018

0

0

409

Data:

17 jul 1921 ano

Agora

~ 104 years ago

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