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- LEFFEL'S IMPROVED DOUBLE TURBINE WATER WHEEL.
- Leffels' Improved Turbine Water Wheel advertisement from June 1887. Page 6.
- Left side of schematic diagram of a Woodward jet engine governor.
- Left side of the James-Leffel turbine unit.
- Legacy aircraft engine governors in the Oldwoodward.com collection.
- Legacy governors on display in the collection.
- Legacy turbine water wheel governor history project.
- Legacy turbine water wheel governor history project. 10.
- Legacy turbine water wheel governor history project. 11.
- Legacy turbine water wheel governor history project. 12.
- Legacy turbine water wheel governor history project. 13.
- Legacy turbine water wheel governor history project. 14.
- Legacy turbine water wheel governor history project. 2.
- Legacy turbine water wheel governor history project. 3.
- Legacy turbine water wheel governor history project. 4.