2004-10-30/2019-10-11 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Established firm with John W. Gratian and William W. Witmer in Des Moines, Iowa, 1892. Source: Musical Courier March 9, 1892, 22.
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