- LEFFEL 002
- LEFFEL 002
- LEFFEL 003
- LEFFEL 004
- LEFFEL 005
- Leffel Company data from 1869.
- Leffel hydraulic turbines since 1862
- Leffel hydraulic turbines since 1862
- Leffel Turbine ad
- Leffel Turbine ad
- Left side of the James-Leffel turbine unit.
- 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.