2004-10-30/2019-02-11 - 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 George Mack and Gottlieb Mack in Bloomfield, New Jersey; relocated to Coburn Organ Co. shop in Chicago, Illinois, 1900; last listed 1900. Sources: Stopt Diapason #27 (Chicago Chapter of Organ Historical Society).
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