2004-10-30/2019-02-11 - 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 Roman Guenther, Tigard, Oregon, 1964. Patent #3,160,051; 8 Dec. 1964; electropneumatic action. Source: Information taken from the text of a United States patent.
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