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| All Patents in class 73/86 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,470,498 | May 17, 1949 | H.Y. Lankford | Device for Measuring the Thickness of Walls or the Like, Subject to Erosion | special purpose gauges | |
| 3,827,290 | Aug. 06, 1974 | A. Carlson | Stream table study center | ||