2004-10-30/2019-11-17 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Patents awarded to Christian Stollewerk, Aix-La-Chapelle, Germany, 1902-1903. Patent #691,501; January 2, 1902; organ. Patent #731,080; June 16, 1903; thumbboard for stop action. Source: Information taken from the text of the United States patents listed above.
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