- Woodward Governor Company ad from 1925.
- Hamilton Sunstrand. 7
- Hamilton Sunstrand. 6
- Hamilton Sunstrand. 5
- Hamilton Sunstrand. 4
- Hamilton Sunstrand. 3.
- Hamilton Sunstrand. 2
- Hamilton Sunstrand fuel control for the GE T700 jet engine.
- Engineering News-Record History
- CATERPILLAR TRACTOR ADVERTISEMENT, CIRCA 1925.
- An advertisement from 1925.
- An advertisement from 1925.
- AiResearch U
- AiResearch R
- A JT8 type jet engine fuel control. 7.