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Who invented the speaker?

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  1. 9 May, 17:20
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    Alexander Graham Bell patented his first electric loudspeaker (capable of reproducing intelligible speech) as part of his telephone in 1876, which was followed in 1877 by an improved version from Ernst Siemens.
  2. 9 May, 17:34
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    Alexander Graham Bell

    Explanation:

    Alexander Graham Bell
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