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- A vintage Water Wheel Manufacturing History Project.
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- THE NATIONAL WATER WHEEL COMPANY.
- Page 2.
- GILLESPIE'S PATENTED HYDRAULIC GOVERNOR, CIRCA 1866.
- Brad's Vintage Water Wheel Governor Patent Project.
- GILLESPIE'S PATENTED HYDRAULIC GOVERNOR.
- Patent number 341,577. Sheet 3.
- Patent number 341,577. Sheet 2.