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 Donald B. Koepke, Franklin Park, Illinois, 1979. Patent #4,173,166; 6 Nov. 1979; electric stop tablet. Source: Information taken from the text of a United States patent.
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