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      Knowledge is Power

      Scientific American July 31, 1909

      Device for Removing Broken Wood Screws

      • By G. H. Sinclair on July 31, 1909

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      More in the July 31, 1909 issue of Scientific American
      • Baseball at Night
      • Experiments with Alternating Current, Using a Small Direct-Current Motor
      • Patents - July 31, 1909
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