2004-10-30/2019-10-17 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Organ Historical Society, 1991). — (Brother of Burt R. Van Valkenburg?); partner with brother in American Photo-Player firm of San Francisco, California, c. 1912-1918. Sources: Louis J. Schoenstein, Memoirs of a San Francisco Organ Builder (San Francisco: Cue Publications, 1977), 594. Elizabeth Towne Schmitt.
2015-10-26/2020-04-09 - See main entry: American Photo Player Co.
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