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      Scientific American August 31, 1918

      Position-Light Signals for Railroad Service

      • By A. H. Rudd on August 31, 1918

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      More in the August 31, 1918 issue of Scientific American
      • How can Soft Coal be Burned without Smoke in Marine Boilers?
      • The Ornithopter
      • Valonia Tanning Material
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