- The Woodward Governor Company's factory down by the Rock River in the Water Power District in Rockford, Illinois.
- The Woodward Governor Company's Mill Street factory assembly floor in the 1930's.
- A vintage Gardner Governor Company advertisment.
- A vintage Gardner Governor Company advertisment.
- A schematic drawing showing the Woodward Airbleed type turboprop engine governor.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1920.
- Allis-Chalmers office in Wisconsin, circa 1925.
- The Allis-Chalmer Manufacturing Company in West Allis, Wisconsin, circa 1930.
- A restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914.
- Brad's restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914.
- A restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914. 3.
- Brad's restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914. 4
- A restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914. 5.
- A restored Schwarze Electric Company Bell from patent number 1,180,445, circa 1914. 2.
- From the vintage advertisement collection.