2004-10-30/2019-04-23 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Richmond, Va.: Organ Historical Society, 1997). - Scappoose, Oregon, 1977. With George T. Kirkwood and John T. Whitney: Patent #4,023,457; May 17, 1977; switching system. Source: Information taken from the text of a United States patent.
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