- PELTON WATER WHEEL COMPANY HISTORY.
- Aviation Week ad showing General Electric's J79 jet engine.
- TYLER'S IMPROVED WATER WHEEL TURBINE, CIRCA 1864.
- PELTON WATER WHEEL COMPANY HISTORY.
- Leffel hydraulic turbines since 1862.
- Woodward and the James Leffel Company go way back in history.
- SAMSON WATER TURBINE CATALOGUE.
- James Leffel & Company advertisement.
- SAMSON TURBINE CATALOGUE.
- resolver
- Woodward legacy jet engine fuel controls.
- THE JAMES LEFFEL AND COMPANY ADVERTISEMENT.
- WHALEN TRANSFER COMPANY.
- Catalogue for the vertical samson turbine installation, circa 11-13-1944.
- LEFFEL HYDRAULIC TURBINES.