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Alexander graham bell invented the harmonic or musical telegraph, which enabled

Alexander graham bell invented the harmonic or musical telegraph, which enabled
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Alexander graham bell invented the harmonic or musical telegraph, which enabled

User Ramanathan K
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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
User M Reddy
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