2004-10-30/2019-04-29 - Note from the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - With E. R. Kilgen Organ Co. of St. Louis, Missouri, president, director. Source: Elizabeth Towne Schmitt.
2015-09-27/2019-02-11 - Note from Organ Database Builders editor Stephen Hall, February 3, 2018. - Leonard S. Kosakowski died on September 30, 1962. Sources: Moose Roots, "Leonard S. Kosakowski", http://death-records.mooseroots.com/d/n/Leonard-Kosakowski.
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