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 Wolff firm of Laval, Québec, Canada, 1989. Source:
2018-05-07/2019-02-05 - See main entry: Hellmuth Wolff & Associés Ltée.
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