2004-10-30/2020-04-09 - From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). — With A.R. Schopp's Sons firm of Alliance, Ohio, 1982. Sources: American Institute of Organbuilders (AIO), Membership Roll 1982.
2015-10-07/2020-04-09 - See main entry: A. R. Schopp & Sons Inc.
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