Petersen, Max S.2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/6890O-53; Diagram of Westinghouse Quick-Action triple valve used on railroad car air brakes (lap position). Oliver Iron Mining Company, Hibbing, Minnesota (Hibbing-Chisholm District) - M. S. Petersen - July 1945.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.Date scanned: 2002-06-21.Rights management statement available at: http://library.mines.edu/digital/rights.htmlRailroadsStillImage