- THE BARBER-COLMAN COMPANY HISTORY.
- INGERSOLL MILLING MACHINE COMPANY.
- A Rockford machine shop manufacturing history project.
- INGERSOLL MILLING MACHINE COMPANY.
- Made In Rockford.
- Made In Rockford.
- A Rockford machine shop manufacturing history project.
- A Rockford machine shop manufacturing history project.
- A Rockford machine shop manufacturing history project.
- The Rockford Tool Company.
- A Rockford machine shop manufacturing history project.
- Brad's Sundstrand hydraulic transmission APU governor manufactured by Woodward.