alsafy3457 alsafy3457
  • 08-09-2017
  • History
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Alexander graham bell invented the harmonic or musical telegraph, which enabled

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Kalahira
Kalahira Kalahira
  • 20-09-2017
Telegraph with dot-and-dash marsh code basically limited to receive,send one message at a time. Bell extensive knowledge nature sound understand music and more than one message can be sent over a single telegraph wire at same time
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