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- 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.
- A vintage machine shop manufacturing history project.
- Tractor and Gas Engine Review