2004-10-30/2019-10-28 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Patents granted to Charles C. Russell of Chicago, Illinois: Patent #1,070,739; August 19, 1913; automatic pneumatic organ. Patent #1,400,239; December 13, 1921; automatic pneumatic organ valve. Patent #1,400,240; December 13, 1921; automatic pneumatic organ valve. Source: Information taken from the text of the United States patents listed above.
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