- The Woodward Governor Company's Machine Shop.
- A Vintage Machine Shop Manufacturing History Project.
- 36
- 34
- 33
- Made in Rockford, Illinois.
- A vintage Rockford machine shop manufacturing history project.
- 01
- uva.x001040837-seq 573
- COTTA TRANSMISION ROCKFORD, ILLINOIS, CIRCA 1919.
- EMERSON-BRANTINGHAM COMPANY
- The Pickering Governor Company.
- The Pickering Governor Company.
- A vintage machine shop manufacturing history project.
- Tractor and Gas Engine Review.