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| All Patents in class 417/3 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE4,086 | Aug. 02, 1870 | B. Holly | Water Supply Regulator | |
| 1,412,069 | Apr. 11, 1922 | F.E. Stevenson | Automatic Control for Hydraulic Pumps | ||
| 2,713,826 | Jul. 26, 1955 | W.H. Tinker | Fluid Pumping System | ||