| All Patents in class 33/290 |
Patents 1 -
15
of 15
      |
| Number | Date | Patentee | Title | Type |
| 30,914 | Dec. 18, 1860 | T. Joyce, G.N. Fairchild | Collimator | inclinometers |
| 79,266 | Jun. 23, 1868 | J.D. Sibley | Spirit Level | levels |
| 79,582 | Jul. 07, 1868 | H.G. Loomis | Level Sights | levels |
| 313,657 | Mar. 10, 1885 | W.L. Curtis | Surveying Instrument | surveying apparatus |
| 359,236 | Mar. 08, 1887 | W.R. Vogt | Spirit Level | |
| 360,536 | Apr. 05, 1887 | T.J. Megown | Leveling Instrument | spirit levels |
| 360,837 | Apr. 05, 1887 | W.A. Wright | Leveling Instument | surveying apparatus |
| 365,033 | Jun. 14, 1887 | O.D. Wood | Spirit Level | wooden levels |
| 402,869 | May 07, 1889 | J.A. Traut | Sighting Attachment for Levels | levels |
| 405,624 | Jun. 18, 1889 | J.A. Traut | Sighting Attachment for Spirit-Levels | levels |
| 479,518 | Jul. 26, 1892 | C.H. Lockwood | Leveling Instrument | |
| 948,777 | Feb. 08, 1910 | U. Tuomi | Combined Square, Level, and Plumb | combination tools |
| 1,189,422 | Jul. 04, 1916 | C. Bodmer | Sighting attachment for levels | levels |
| 1,265,823 | May 14, 1918 | A.J. Skjonsbye | Level | levels |
| 2,981,141 | Apr. 25, 1961 | D.W. Berry, J.A. Armstrong | Optical Compensator and Tilt Detector | optical measuring gauges |
