2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). - Charles E. Barkstrom, Chicago, Illinois, Patents held: Patent #1,037,578; 3 Sep. 1912; reed pipe Patent #1,458,382; 12 Jun. 1923; pipe. Sources: Information taken from the text of a United States patent.
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