- Rockford, Illinois factory history.
- INGERSOLL MIILLING MACHINE COMPANY HISTORY.
- Rockford, Illinois manufacturing history.
- Rockford, Illinois history.
- INGERSOLL MILLING AND MANUFACTURING COMPANY HISTORY.
- Philadelphia Gear Works
- Rockford, Illinois manufacturing history.
- Gisholt Machine Company
- GISHOLT
- INGERSOLL MILLING MACHINE COMPANY
- Fabroil gears
- Foote Gears
- INGERSOL MIILLING MACHINE COMPANY HISTORY.
- INGERSOLL MILLING MACHINE COMPANY. b
- Gisholt Machine Company