Petersen, Max S.2007-01-032022-02-032007-01-032022-02-03http://hdl.handle.net/11124/6837Date scanned: 2002-6-21.O-46-A; Safety block on drill sharpener. Block is held in position between jaws on machine by a spring, and is removed by operating a foot valve that emits compressed air into a cylinder, the piston of which is connected to the safety block. Oliver Iron Mining Company (Hibbing-Chisholm District) - Aug. 1945 - M. S. Petersen.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.The Oliver Iron Mining Company was organized in 1892 and acquired a number of mineral properties in Minnesota and in the Upper Peninsula. By 1901 the Company was a division of United States Steel Corporation.Rights management statement available at: http://library.mines.edu/digital/rights.htmlOliver Iron Mining CompanyIron mines and miningMiningScenes, interiorStillImage