The J.H. Thomas & Sons Co. was located in Springfield, Ohio and was known to have been a manufacturer of portable steam engines (ca 1880s).
Information Sources:
- Norbeck, Jack, Encyclopedia of American Steam Traction Engines, Crestline Publishing Inc, Glen Ellyn, Illinois, pg. 48
- Steam Power on the American Farm by Reynold M. Wik, 1953 page 254