Graphophone
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Charles Sumner Tainter
Mass communication
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Timeline of the telephone
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Nathan Stubblefield
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1880 in science
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Dictaphone
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Wireless
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Optical communication
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Phonograph cylinder
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Watertown, Massachusetts
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Free-space optical communication
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Photophone
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Optical disc
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Thomas Edison
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Bell Labs
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April 25
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Alexander Graham Bell
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Charles Summer Tainter
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