2004-10-30/2019-11-15 - From the OHS PC Database, derived from A Guide to North America Organ Builders by David H. Fox (Organ Historical Society, 1991). — With Möller firm of Hagerstown, Maryland, 1922. Source: The Diapason February 1922, 9.
2015-10-16/2019-02-05 - See main entry: M.P. Möller, Inc.
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