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). - Patents awarded to Ellis F. Frost, Washington, DC. 1917. Patents awarded: Patent #1,228,899; June 5, 1917; electric action Patent #1,243,280; October 16, 1917; electric action Source: Information taken from the text of United States patents.
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