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      Scientific American December 21, 1912

      Sending Photographs Over a Telephone Wire

      The Improved Bélin Apparatus

      • By Jacques Boyer on December 21, 1912

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      More in the December 21, 1912 issue of Scientific American
      • Correspondance - December 21, 19
      • Steady Rests for Small Lathes
      • Holding Circular Saws While Sharpening
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