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      Scientific American May 13, 1905

      The Auxetophone for Reinforcing Gramophone Sounds

      BY THE ENGLISH CORRESPONDENT OF THE SCIENTIFIC AMERICAN.

      • May 13, 1905

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      More in the May 13, 1905 issue of Scientific American
      • A Petrified Forest Covering Thousands of Acres
      • Index of Inventions - May 13, 1905
      • A Visit to the Interior of the Crater of Mont Pele and a Partial Ascent of the New "Dome"
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