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| All Patents in class 33/367 | |||||
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| Number | Date | Patentee | Title | Type | |
| 26,762 | Jan. 10, 1860 | S.D. Hailey | Surveyor's Level | levels | |
| 313,657 | Mar. 10, 1885 | W.L. Curtis | Surveying Instrument | surveying apparatus | |
| 825,760 | Jul. 10, 1906 | J.L. Russell | Liquid Level | levels | |
| 1,203,702 | Nov. 07, 1916 | A.J. Cashel | Level | levels | |
| 4,603,485 | Aug. 05, 1986 | L.D. Ostby | Leveling Apparatus | machinist levels | |