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| All Patents in class 33/292 | |||||
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| Number | Date | Patentee | Title | Type | |
| 18,728 | Dec. 01, 1857 | C. Becker | Surveying Level | level adjustments | |
| 60,788 | Jan. 01, 1867 | W.L. Richardson | Sighting Level | levels | |
| 234,709 | Nov. 23, 1880 | J.W. Harmon | Leveling-Instrument | levels | |