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      Scientific American February 16, 1907

      The making and the using of a Wireless Telegraph Tuning Device.—IV

      • By A. Frederick Collins on February 16, 1907

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      More in the February 16, 1907 issue of Scientific American
      • The Passing of American Square-Rigged Vessels
      • Beet Sugar Manufacture in Italy
      • Selecting the Proportions for Concrete
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