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      Knowledge is Power

      Scientific American December 24, 1870

      Applications for Extension of Patents- December 24, 1870

      • December 24, 1870

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      More in the December 24, 1870 issue of Scientific American
      • Gas Stove
      • Milking-Stool and Pail-Holder
      • Recent American and Foreign Patents- December 24, 1870
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