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| All Patents in class 73/309 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,096,411 | Oct. 19, 1937 | T. Rynalski, H.M. St. John | Gauge | liquid gauges | |
| 2,497,694 | Feb. 14, 1950 | S. Shakin | Tank Gauge | liquid gauges | |