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      Scientific American February 1868

      Use of Screw, Plates--Tempering Saws for Machinists' Use

      • February 1, 1868

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      More in the February 1868 issue of Scientific American
      • Cumbrousness of Tools for Iron Working
      • Nitro-Glycerin--Its use, Its Danger--Who Shall Decide when Experts Disagree?
      • Answers to Correspondents
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