2004-10-30/2019-11-15 - 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 William B. Tunstall, Melrose, Massachusetts, 1909. Patent #926,686; June 29, 1909; pneumatic action. Source: Information taken from the text of the United States patent listed above.
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