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      Scientific American April 24, 1915

      The Sound Wheel, a Novel Wireless Detector, The Albessard Aeroplane and more

      By the Berlin Correspondent of the Scientific American

      • April 24, 1915

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      More in the April 24, 1915 issue of Scientific American
      • Longitudes by Wireless Telegraphy
      • A Clock Built of Straw, Vacuum System of Gasoline Feed and more
      • Valuable Products Recovered from Coke Oven Gases
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