"Eugene Dietzgen was born in Uckerrath, Germany on May 6, 1862.  He died in Chicago on December 1, 1929.  He came to America in 1880.  The company was founded on November 13, 1885 under the name of Luhring & Dietzgen.  This partnership was succeeded by Eugene Deitzgen & Co. in 1891.  Successor corporation under the name of Eugene Dietzgen Co. of Illinois occured on February 3, 1893 and the present corporate company, Eugene Dietzgen Co. of Delaware was incorporated in Delaware on October 29, 1917."

Reference:  Smart, Charles E.   The Makers Of Surveying Instruments In America Since 1700  Troy, New York:  Regal Art Press.  1962