2004-10-30/2019-04-29 - 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 George T. Kirkwood, Hillsboro, Oregon, jointly with John T. Whitney and Patrick M. Castle, 1977. Patent #4,023,457; 17 May 1977; switching system. Source: Information taken from the text of a United States patent.
Regrettably, it is not possible to display the information about the sponsor of this pipeorgandatabase entry or if there is a sponsor. Please see About Sponsors on Pipe Organ Database.