2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, revised edition, by David H. Fox (Organ Historical Society, 1997). - Royal C. Coburn was with Charles Kilgen & Son of St. Louis, Missouri, 1939. Source: Elizabeth Towne Schmitt.
2018-05-07/2020-04-09 - See main entries: Charles C. Kilgen, Sr. and Geo. Kilgen & Son, Inc.
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