2004-10-30/2019-09-28 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - Active in Allentown and Lehigh County area, Pennsylvania, c. 1840 to after 1873. Sources: Raymond J. Brunner. Barbara J. Owen and Thomas Cunningham, "New Revised Builders List", The Tracker, 9:2, 11. John Speller.
2020-11-26/2020-11-26 - Heintzelmann was the spelling used on a contract from the 1870s for an organ in Coopersburg, Pennsylvania. -Paul R. Marchesano
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