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.