- Elmer Woodward's new oil pressure relay valve water wheel governor ca 1912.
- IMPULSE TURBINES BY SMITH. BULLETIN 138.
- James Leffel & Company advertisement.
- LEFFEL HYDRAULIC TURBINES.
- THE JAMES LEFFEL AND COMPANY ADVERTISEMENT.
- LEFFEL QUALITY...
- Leffel Turbines...
- Leffel hydraulic turbines since 1862.
- Woodward and the James Leffel Company go way back in history.
- Woodward data processing flow chart. Show me the data!
- Woodward and the James Leffel Company go way back in history.
- Vintage advertisement with both Woodward and James Leffel Companies.
- SAMSON WATER TURBINE CATALOGUE.
- resolver
- Woodward catalogue M data.