2004-10-30/2019-10-17 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — (Brother of Hal Vankenburg; partner with brother in American Photo-Player firm of San Francisco, California, c. 1912-1916?); in Oakland, California. Patents held: Patent #1,126,137; January 26, 1915; crescendo valve. Patent #1,195,536; August 22, 1916; pneumatic action. Patent #1,243,644; October 16, 1917; tremolo. Source: Information taken from the text of the United States patents listed above.
2018-05-07/2020-04-09 - See main entry: American Photo Player Co.
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