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      Knowledge is Power

      Scientific American February 19, 1921

      Solid Fuel for the Gas Engine

      • By Ralph Howard on February 19, 1921

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      More in the February 19, 1921 issue of Scientific American
      • A Rural School Museum
      • Round Seeds and Mechanical Ingenuity, Making Porous Bricks of Slag
      • The Motor-Driven Commercial Vehicle
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