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      Scientific American March 06, 1920

      Putting Infra-Red Rays to Work

      How the French Army and Navy Make Use of Heat Rays for Invisible Signalling

      • By George Gaulois on March 6, 1920

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      More in the March 06, 1920 issue of Scientific American
      • Inventions New and Interesting - March 6, 1920
      • Vermont Talc
      • A Year's Supply of Raw Material for the Melting Pot, Wartime Bureaus and the Taxpayer and more
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