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| All Patents in class 73/290R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 4,972 | Feb. 20, 1847 | W.H. Baker, H.R. Worthington | Apparatus for gaging the height of water in boilers | ||
| 2,523,653 | Sep. 26, 1950 | C.F. Erikson | Force Feed Lubrication | ||