2004-10-30/2020-04-09 - From the OHS PC Database, derived from A Guide to North America Organ Builders by David H. Fox (Organ Historical Society, 1991). -- Brief partnership of Granville Wood and Frederick J. Simmons in Detroit, MI, 1880.
2015-10-29/2020-04-09 - For more information, see: Granville Wood Frederick J. Simmons
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