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2 Jun 1875 Jahr - Bell proves that telephones work

Beschreibung:

Watson happens to pluck one of the metal reeds that formed Bell's phonoautograph machine. This accidental move showed that a telephone could transmit sounds.

Zugefügt zum Band der Zeit:

Alexander Graham Bell

ByAlicia Gracidas-Guldan
20 Dez 2018
0
0
532

Datum:

2 Jun 1875 Jahr
Jetzt
~ 150 years ago
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