2004-10-30/2019-04-23 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Organ Historical Society, 1997). — Homer, New York, 1968. With Douglas E. Powell: Patent #3,380,026; April 23, 1968; electronic combination. Source: Information taken from the text of a United States patent.
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