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Process of Making The Harmonic Telegraph & a Voice Transmitting Device (1 ene 1873 año – 31 dic 1875 año)

Descripción:

Bell & Watson worked on both the harmonic telegraph & a voice transmitting device from about 1873 to 1875

Añadido al timeline:

Bell Telephone Invention

ByQueen Geli
13 feb 2018
1
0
433

fecha:

1 ene 1873 año
31 dic 1875 año
~ 2 years and 11 months
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