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| All Patents in class 73/293 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,602,064 | Oct. 05, 1926 | W.O. Ashe | Water Gauge | ||
| 1,689,191 | Oct. 30, 1928 | W.O. Ashe | Water Column | ||
| 2,450,267 | Sep. 28, 1948 | R.A. Culbertson, C.M. Angel | Water Gauge | ||
| 2,514,570 | Jul. 11, 1950 | C.F. Erikson | Liquid Level Gauge | ||
| 2,585,104 | Feb. 12, 1952 | B. Folke, Administratrix, B.E. Folke, deceased (Estate of) | Water Gauge | ||