2004-10-30/2019-04-29 - Note from the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Organ Historical Society, 1991). Edited for the revised OHS Online Database website, 2017. - Patent awarded to Leonard W. Ellen, Great Missenden, England. Patent #4,408,517; 11 Oct. 1983; electronic control for organ. Source: Information taken from the text of a United States patent.
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