2004-10-30/2019-02-11 - From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). - With M.P. Möller of Hagerstown, Maryland, 1914. Sources: Diapason, April 1914, 2.
2015-09-03/2019-02-05 - See main entry: M.P. Möller, Inc.
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