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      Knowledge is Power

      Scientific American July 1929

      Foiling the Burglar

      From Time Immemorial Man Has Tried to Protect His Worldly Goods From the Hands of the Despoiler

      • By Albert A. Hopkins on July 1, 1929

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      More in the July 1929 issue of Scientific American
      • Earth Shine
      • Groupings in the Aviation Industry
      • Simple Tightener for Tennis Nets, Baby Roadster and More
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