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      Scientific American January 16, 1904

      Patent Department

      Front Cylinder Head for Rock Drills

      • January 16, 1904

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      More in the January 16, 1904 issue of Scientific American
      • Index of Inventions - January 16, 1904
      • The Orthodiagraph. An Apparatus for Determining the True Shape and Size of Internal Organs
      • Legal Notes - January 16, 1904
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