2004-10-30/2019-11-17 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — With Koehnken & Co. of Cincinnati, Ohio, 1860s. Source: Kenneth Wayne Hart, "Cincinnati Organ Builders of the Nineteenth Century" part 2,The Tracker 21:1 (1977), 5.
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