| All Patents in class 33/387 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 52,579 | Feb. 13, 1866 | R. Ledig | Improvement in Spirit-Levels | inclinometers |
| 75,533 | Mar. 17, 1868 | L.L. Davis | Spirit Level | inclinometers |
| 151,173 | May 19, 1874 | J. Thornley | Grading Levels | inclinometers |
| 306,429 | Oct. 14, 1884 | H.M. Rich | Inclinometer | inclinometers |
| 596,279 | Dec. 28, 1897 | C.M. Potter | Level | levels |
| 655,561 | Aug. 07, 1900 | J. Kurig | Level Quadrant for High Elevation Guns | inclinometers |
| 785,581 | Mar. 21, 1905 | A.V. Shorts | Level | level adjustments |
| 794,175 | Jul. 11, 1905 | A.P. Hall | Adjustable Level and Incinometer | inclinometers |
| 902,269 | Oct. 27, 1908 | J.D. Weaver | Spirit-Level | inclinometers |
| 1,006,818 | Oct. 24, 1911 | L.B. Worden | Leveling and Plumbing instrument | levels |
| 1,265,823 | May 14, 1918 | A.J. Skjonsbye | Level | levels |
| 1,539,543 | May 26, 1925 | R.A. Cecchini | Protractor Level | inclinometers |
| 2,206,817 | Jul. 02, 1940 | D.W. Mann | Precision Spirit Level | machinist levels |
| 3,289,301 | Dec. 06, 1966 | O.O. Hanson | Carpenter's tool | |
