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      Knowledge is Power

      Scientific American April 20, 1912

      The Industry of Orǵanic Plastic Materials

      Celluloid and its Substitutes

      • April 20, 1912

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      More in the April 20, 1912 issue of Scientific American
      • An Electrically Operated Aerial Ferry at Osten
      • New Applications of Tunǵsten and Molybdenum
      • The Telephone in Photoelectric Observations
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