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| All Patents in class 33/351 | |||||
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| Number | Date | Patentee | Title | Type | |
| 17,870 | Jul. 28, 1857 | C. Cole | Adjustment Applied to Pendulum Levels | level adjustments | |
| 280,713 | Jul. 03, 1883 | E.A. Bostrom | Leveling Instrument | ||
| 933,912 | Sep. 14, 1909 | A.J. Matter | Protractor Level | clinometers | |
| 1,265,823 | May 14, 1918 | A.J. Skjonsbye | Level | levels | |
| 1,409,833 | Mar. 14, 1922 | H.A. Cook | Railroad Inclinometer | inclinometers | |