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"Listed in St. Louis directories, as follows: 1891 Mahn & Co. (Herman Mahn) surgical instruments. 1906 Mahn & Co. (Herman Mahn) instrument makers." Reference: Smart, Charles E. The Makers Of Surveying Instruments In America Since 1700 Troy, New York: Regal Art Press. 1962
Instrument shown is from the collection of the National Museum of American History, a division of the Smithsonian Institution
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