"St. Louis (Missouri) Directories:  1854-1855 Wuger, Konrad, mathematical instrument maker 112 S. 2nd.  1857-60 Wuger, Konrad, mathematical instrument maker 63 n. 2nd r. same.  1861-63 no directories.  1864-65 not listed."

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