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Creation date / 2020 / January / 18
- MADE IN ROCKFORD, ILLINOIS, U.S.A.
- A vintage Rockford machine shop manufacturing history project.
- WATCH YOUR CUTTERS
- CINCINNATI MILLERS
- The Carborundum Company.
- THE JOHNSON FRICTION CLUTCH COMPANY.
- The Rockford Tool Company. 2
- American Machinist Magazine.
- Rockford, Illinois manufacturing history.
- ALLIS-CHALMERS
- INGERSOLL MILLING MACHINE COMPANY. c
- Union Twist Drill Company. 2
- Gears
- National Trwist Drill
- Rockford, Illinois manufacturing history.