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      Knowledge is Power

      Scientific American July 10, 1920

      Toys that do Great Work

      The Indispensable Place Occupied by Models in the Engineering of Today

      • By M. A. Henry on July 10, 1920

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      More in the July 10, 1920 issue of Scientific American
      • Fish Fancying and Freak Farming, The $5,000 Einstein Essay Contest and more
      • The Mechanical Hello Girl
      • Handling the Heating-Furnace Doors
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