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).

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.