2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - Patent awarded to Albert W. Imhoff, Orrville, Ohio, 1962. Patent #3,018,682; January 30, 1962; tremolo. Source: Information taken from the text of a United States patent.
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