2004-10-30/2019-11-10 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — WithKoehnken & Co. of Cincinnati, Ohio, 1860s. Source: Kenneth Wayne Hart, "Cincinnati Organ Builders of the Nineteenth Century" part 3, The Tracker, 21:1 (Richmond, Va.: Organ Historical Society, 1976), 5.
2015-10-16/2019-11-10 - See main entry: Koehnken & Co.
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