2004-10-30/2019-04-29 - 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). - San Francisco, California, 1920. Patent #1,331,506; February 24, 1920; selective player mechanism. Source: Information taken from the text of a United States patent.
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