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- 3,142,154. Page 6.
- 3,142,154. Page 3.
- 3,142,154. Page 2.
- Patent 3,142,154, filed Dec. 19, 1960.
- Woodward Governor Company's shop order #1845, circa 1909.
- BLUEPRINT ON TRACING PAPER FROM 1918.
- A vintage Water Wheel Manufacturing History Project.
- The Woodward Company and the James Leffel & Company are still in business in the year 2020. History in the making!
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- THE JAMES LEFFEL COMPANY, CIRCA 1944.
- READING SHOP BLUEPRINT HISTORY.
- STEAM ENGINES AND VALVE SETTING HISTORY.
- Another example of a blueprint of a mechanical water wheel governor Size D series 3, circa 1926.
- Woodward Governor Company Shop Order 3155, SN # 5719, circa 1926.