2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - Chicago, Illinois, 1919-1928. Patent #1,302,511; May 6, 1919; electropneumatic valve. Patent #1,465,418; August 21, 1923; stop action. Patent #1,665,254; April 10, 1928; electropneumatic combination. Sources: Information taken from the text of United States patents.
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