2004-10-30/2019-12-14 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Patents issued to John W. Darley Jr. of Baltimore, Maryland, 1908. Patent #881,464; March 10, 1908; crescendo device for organ. Patent #1,155,300; September 28, 1915; expression device for organ.
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