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      Knowledge is Power

      Scientific American January 06, 1917

      How the Car Doors of the New York Municipal Railway are Operated

      • By Herbert T. Wade on January 6, 1917

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      More in the January 06, 1917 issue of Scientific American
      • Retrospect of the Year 1916
      • A Dam that Never Overflows, Rabies Among Wild Animals
      • Electric Pleasure Cars for 1917
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