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Keywords: Ahrons (1921) Steam Locomotive Construction and Maintenance Fig20.png Marking-off cylinder port faces Original Steam Locomotive Construction and Maintenance p 50 Fig 20 <br>Scan Internet Archive “ http //www archive org/details/steamlocomotivec00ahrorich 1921 E L Ahrons PD-old-auto-1923 1925 PD-old Scans from Ahrons 1921 Steam Locomotive Construction and Maintenance Steam engines with slide valves |