2004-10-30/2019-04-07 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Succeeded Votteler-Hettche firm; established by Henry B. Votteler, Henry H. Holtkamp, and Alan G. Sparling, 1914; succeeded by Holtkamp Organ Co., 1951. Staff: Mary Holtkamp; Walter Holtkamp; John Wright. Sources: The Diapason, Chicago, IL, June 1926, 18. David L. Junchen, Encyclopedia of the American Theatre Organ, vol. 2 (Pasadena: Showcase Publications, 1989), 655. Organ Handbook: (Richmond, Va.: Organ Historical Society), 1970. Elizabeth Towne Schmitt.
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