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- THE NATIONAL WATER WHEEL COMPANY.
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- A vintage Water Wheel Manufacturing History Project.
- GILLESPIE'S PATENTED HYDRAULIC GOVERNOR.
- Brad's Vintage Water Wheel Governor Patent Project.
- GILLESPIE'S PATENTED HYDRAULIC GOVERNOR, CIRCA 1866.
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- Patent number 1,476,914. 2 Sheets-Sheet 1.
- Patent number 1,476,914. Sheet 2.