Invention of the telephone
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Johann Philipp Reis
Friedrichsdorf
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Gelnhausen
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Timeline of the telephone
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1874 in science
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1834 in science
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List of electrical engineers
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Philip Reis
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Microphone
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Loudspeaker
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1834
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1874
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Telephone
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January 14
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January 7
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Alexander Graham Bell
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Philipp Reis
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