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| All Patents in class 33/291 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,031X | Aug. 17, 1835 | A. Munger | Pendulum Level | plumb bobs | |
| 26,762 | Jan. 10, 1860 | S.D. Hailey | Surveyor's Level | levels | |
| 280,713 | Jul. 03, 1883 | E.A. Bostrom | Leveling Instrument | ||
| 314,511 | Mar. 24, 1885 | E.A. Bostrom | Leveling Instrument | surveying apparatus | |
| 925,058 | Jun. 15, 1909 | A. Wain | Automatic Leveling Apaaratus | surveying apparatus | |