2004-10-30/2019-02-11 - From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). - B. H. Ballard was associated with the E. R. Kilgen Co. of St. Louis, Missouri, in Tulsa, Oklahoma, 1939. He did tuning and installation work for Kilgen. Source: Diapason, September 1939, 2.
2015-08-29/2020-04-09 - See main entry: E. R. Kilgen Co.
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