Originally know as Otis Bros. & Co.
Manufactured Steam & Gas Engines to power the elevators that were their main product.
Information Sources
- American Steam Engine Builders: 1800-1900 by Kenneth L. Cope, 2006 page 176
- American Gasoline Engines Since 1872 by C. H. Wendel, Volume #1, 1983 page 364
- The Complete Guide to Stationary Gas Engines by Mark Meincke, 1996 page 151