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25 März 1857 Jahr - Phonautograph was patented.

Beschreibung:

A phonautograph is one of the earliest known ways of recording sound. The device was first patented on the 25th of March, 1857. It drew on glass as it received sound. These drawings were the first visual representation of sound.

Zugefügt zum Band der Zeit:

23 Jan 2018
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Datum:

25 März 1857 Jahr
Jetzt
~ 168 years ago

Abbildungen: