• Maas Mine relay switch 

        Author(s):Petersen, Max S.; Arthur Lakes Library; Russell L. and Lyn Wood Mining History Archive; United States. Bureau of Mines
        Date:1945-03
        The Maas Mine is located in the Marquette Range near Negaunee, Michigan. The Mine was discovered by George Maas and leased to the Cleveland-Cliffs Iron Company in 1901. Cleveland-Cliffs Iron Company was formed with the ...