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). - Lewis T. Barkstrom, Chicago, Illinois, 1930. Patent #1,747,414; 18 Feb. 1930; pneumatic coupler. Source: Information taken from the text of a United States patent.
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