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- Woodward Governor Company's shop order #1845, circa 1909.
- Woodward Governor Company Shop Order 3155, SN # 5719, circa 1926.
- What is a AC MOTOR?
- The Woodward Company and the James Leffel & Company are still in business in the year 2020. History in the making!
- The new Woodward Hydraulic Governor, circa 1914.
- THE JAMES LEFFEL COMPANY, CIRCA 1944.
- The Holy Bible history book.
- STEAM TURBINES AND CONDENCER HISTORY DATA.
- STEAM ENGINES AND VALVE SETTING HISTORY.
- Simplify Your Life with Woodward Energy Controls.
- READING SHOP BLUEPRINT HISTORY.
- POWER PLANT ENGINEERING HISTORY DATA.
- Patent 3,142,154, filed Dec. 19, 1960.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.