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      Scientific American September 16, 1871

      Answers to Correspondents- September 16, 1871

      • September 16, 1871

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      More in the September 16, 1871 issue of Scientific American
      • Narrow Gage Nonsense
      • Recent American and Foreign Patents- September 16, 1871
      • The New York Iron Founders Grievance--A System of Shameless Extortion
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