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| All Patents in class 73/325 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,514,570 | Jul. 11, 1950 | C.F. Erikson | Liquid Level Gauge | liquid gauges | |
| 2,585,104 | Feb. 12, 1952 | B. Folke, Administratrix, B.E. Folke, deceased (Estate of) | Water Gauge | liquid gauges | |