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      Knowledge is Power

      Scientific American April 1927

      Novel Devices for the Shop and the Home, April 1927

      A Department Devoted to Recently Invented Mechanical and Household Appliances

      • By Albert A. Hopkins on April 1, 1927

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      More in the April 1927 issue of Scientific American
      • Applied Science for the Amateur, April 1927
      • Fishes that Can Shock You
      • Inventors Who Have Achieved Commercial Success, April 1927
      View Full Contents
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