| All Patents in class 33/387 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
 | 52,579 | Feb. 13, 1866 | R. Ledig | Improvement in Spirit-Levels |
 | 75,533 | Mar. 17, 1868 | L.L. Davis | Spirit Level |
 | 151,173 | May 19, 1874 | J. Thornley | Grading Levels |
 | 306,429 | Oct. 14, 1884 | H.M. Rich | Inclinometer |
 | 596,279 | Dec. 28, 1897 | C.M. Potter | Level |
| | 655,561 | Aug. 07, 1900 | J. Kurig | Level Quadrant for High Elevation Guns |
 | 785,581 | Mar. 21, 1905 | A.V. Shorts | Level |
 | 794,175 | Jul. 11, 1905 | A.P. Hall | Adjustable Level and Incinometer |
 | 902,269 | Oct. 27, 1908 | J.D. Weaver | Spirit-Level |
 | 1,006,818 | Oct. 24, 1911 | L.B. Worden | Leveling and Plumbing instrument |
