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| All Patents in class 33/377 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,263 | Apr. 09, 1850 | W.G. Ladd, Jr. | Fluid Level | inclinometers | |
| 25,446 | Sep. 13, 1859 | T.S. Scoville | Spirit-Level | levels | |
| 54,626 | May 08, 1866 | A.J. Vandegrift | Improvement in Spirit-Levels | levels | |
| 96,140 | Oct. 26, 1869 | A.P. Odholm | Improvement in Spirit-Levels | wooden levels | |
| 631,976 | Aug. 29, 1899 | D.J. Whittemore | Level for Tracks | levels | |
| 1,409,537 | Mar. 14, 1922 | H.M. Franzen | Universal Level | levels | |
| 1,417,496 | May 30, 1922 | J.H. Carmean | Sighting Level | levels | |