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- 12
- Union Twist Drill Company
- Union Twist Drill Company. 2
- ALLIS-CHALMERS
- The Carborundum Company.
- American Machinist Magazine.
- THE JOHNSON FRICTION CLUTCH COMPANY.
- CINCINNATI MILLERS
- WATCH YOUR CUTTERS
- Rockford, Illinois manufacturing history.
- Rockford, Illinois manufacturing history.
- Rockford, Illinois manufacturing history.
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