- A Pierce Governor Company advertisement.
- A Pierce Governor Company advertisement.
- A flyball governor for an elevator system.
- A flyball governor for an elevator system.
- A old flyball steam engine governor.
- A flyball governor for an elevator system.
- Two flyball engine governors from the Woodward Governor Company collection.
- A old flyball steam engine governor.
- A flyball governor for an elevator system.
- Flyballs on an elevator governor.
- Flyball Governor
- A flyball governor.
- A flyball governor.
- A flyball clock.
- A flyball governor.