- An Allis-Chalmer Company's Plate Steel Spiral Casting for 70,000 hourse-powered Niagara Falls hydraulic turbine unit.
- The Woodward Governor Company's Mill Street factory assembly floor in the 1930's.
- From the vintage advertisement collection.
- A vintage Caterpillar Company advertisement.
- Allis-Chalmers office in Wisconsin, circa 1925.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1920.
- A schematic drawing showing the Woodward Airbleed type turboprop engine governor.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1930.
- PATENT NUMBER 1,180,445. CIRCA 1914.
- PATENT NUMBER 1,180,445
- A vintage Gardner Governor Company advertisment.
- A vintage Gardner Governor Company advertisment.
- PAGE 2. AIRCRAFT ENGINE CONTROL SYSTEM HISTORY.
- The Woodward Governor Company's factory down by the Rock River in the Water Power District in Rockford, Illinois.
- PATENT 2,530,139. 2 SHEETS-SHEET 1.