- The Woodward Governor Company's Mill Street factory assembly floor in the 1930's.
- The Woodward Governor Company's factory down by the Rock River in the Water Power District in Rockford, Illinois.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1930.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1920.
- PATENT NUMBER 1,180,445. CIRCA 1914.
- PATENT NUMBER 1,180,445
- Patent 3,051,138. Sheet 1 of 2. Hydraulic governors.
- Patent 3,051,138. 2 sheets-sheet2.
- PATENT 2,530,139. SHEET 2 OF 2.
- PATENT 2,530,139. 2 SHEETS-SHEET 1.
- PATENT 2,350,139 PAGE 1. AIRCRAFT ENGINE CONTROL SYSTEM.
- PAGE 9
- PAGE 8
- PAGE 7
- Page 6.