2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders rev. ed. by David H. Fox (Organ Historical Society, 1997) - Partnership of Charles Anderson and George Silsby in Denver, CO, c. 1875. Sources: Barbara Owen Elizabeth Towne Schmitt. Tracker 8:1:2. Tracker 9:2:9.
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