2004-10-30/2020-04-09 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Organ Historical Society, 1997). — Patent awarded to Edward A. McMurtry, Chicago, Illinois 1919. Patent #1,313,711; 19 Aug. 1919; expression keyboard. Source: Information taken from the text of a United States patent.
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