From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991).

Succeeded Stevens & Klock Organ Co. ; established in Marietta, Ohio, 1897; built combination reed and pipe organs, pianos; last listed 1919.

Staff: Frederick Smith; Allan G. Sparling, Collins R. Stevens; C. C. Strecker; B. F. Strecker; D. B. Torpy.

Sources:
-Robert F. Gellerman, Gellerman’s International Reed Organ Atlas (Vestal, NY: The Vestal Press, 1985). 126.
-David L. Junchen, Encyclopedia of the American Theatre Organ, Vol. 2 (Pasadena: Showcase Publications, 1989), 636.
-Piano and Organ Purchaser’s Guide, Purchaser’s Guide to the Music Industries, (New York: Music Trades).

Article by Robert E. Coleberd about Stevens from The Diapason: https://www.thediapason.com/content/stevens-marietta-forgotten-builder-bygone-era