2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - Louis G. Eichman and Peter Butzen, active in Chicago, Illinois, c. 1909; succeeded by Butzen & Co. and P. Butzen & Sons. Sources: Local directories of the period. Michael Friesen. Elizabeth Towne Schmitt.
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