2004-10-30/2019-10-28 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — In Boston, Massachusetts; active in Indianapolis, IN; last listed 1903. Patents held: Patent #107,549; September 20, 1870; tremulant. Patent #465,208; December 15, 1891; mechanical action. Source: Piano and Organ Purchaser’s Guide, Purchaser’s Guide to the Music Industries, (New York: Music Trades).
2019-10-29/2019-10-29 - From the OHS PC Database, (James H. Cook and Elizabeth Towne Schmitt, co-editors). — According to Michael Friesen, one document (a patent application) spells Sanborn's middle name "Prentiss." All other sources use the other spelling.
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