Petersen, Max S.2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/5779Date scanned: 2002-6-20.USBM #64877; Safety hook on compressed-air-operated ventilation door to prevent door from closing due to failure of compressed-air system. Morris Mine, Inland Steel Company, North Lake, Michigan. - M. S. Petersen - October 1946.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.The Morris Mine was an underground iron mine in the Marquette Range, Marquette County, Michigan. The Mine was originally opened in 1909 in operation with the Lloyd Mine and known as the Morris-Lloyd Mine. It was operated as the Morris Mine by the Inland Steel Company starting in 1933 and continuing into the 1950s.Rights management statement available at: http://library.mines.edu/digital/rights.htmlInland Steel CompanyIron mines and miningMine safetyMine ventilationUnderground miningStillImage