2004-10-30/2019-10-08 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — With M. P. Moller firm of Hagerstown, Maryland, 1882. Source: The Diapason February 1928, 6.
2018-05-07/2019-02-05 - See main entry: M.P. Möller, Inc.
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