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      Knowledge is Power

      Scientific American July 21, 1877

      New Woodworking and House and Carriage Building Inventions - July 21, 1877

      • July 21, 1877

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      More in the July 21, 1877 issue of Scientific American
      • Communications - July 21, 1877
      • New Agricultural Inventions - July 21, 1877
      • The Great Problem
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