2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, revised edition, by David H. Fox (Organ Historical Society, 1997). - Philip C. Carlstedt was with American Photo-Player {Robert-Morton} firm of Van Nuys, California, before 1918. Source: The Diapason, July 1918, 5.
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