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      Scientific American May 1928

      Camper's Knife, Eye-Comfort Cards and more

      Novel and Useful Devices Adapted to Many Human Needs

      • May 1, 1928

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      More in the May 1928 issue of Scientific American
      • Making Fiber Board from Wood Chips, An Electric Bug House and more
      • One-piece Automobile Bodies
      • Speed Demons
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