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      Scientific American July 07, 1917

      Recently Patented Inventions- July 7, 1917

      These columns are open to all patentees. The notices are inserted by special arrangement with the inventors.

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      More in the July 07, 1917 issue of Scientific American
      • Re-introducing the Concrete-and-Steel Fortification, Morality at Newport, and more
      • Electricity- July 7, 1917
      • Mobilizing Educational Institutions
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