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      Knowledge is Power

      Scientific American March 29, 1862

      What Can Be Done for Inventors--Advice Gratis and Advice for Pay

      • March 29, 1862

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      More in the March 29, 1862 issue of Scientific American
      • Artillery Matches and Signals
      • Improved Planing Machine, Dangers of Benzine in Varnish Making
      • Our Navy a Year Ago
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