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      Scientific American February 1929

      Are We Slowing Down?, Employers' Shop Rights and more

      A Department of Facts and Notes of Interest to Patentees and Owners of Trademark Rights,

      • February 1, 1929

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      More in the February 1929 issue of Scientific American
      • From the Scrap-book of Science, February 1929
      • Picturing Skill in Golf
      • The "Sinking" Tower of Pisa
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