| All Patents in class 33/290 |
Patents 1 -
10
of 15
      |
| Picture | Number | Date | Patentee | Title |
 | 30,914 | Dec. 18, 1860 | T. Joyce, G.N. Fairchild | Collimator |
 | 79,266 | Jun. 23, 1868 | J.D. Sibley | Spirit Level |
 | 79,582 | Jul. 07, 1868 | H.G. Loomis | Level Sights |
| | 313,657 | Mar. 10, 1885 | W.L. Curtis | Surveying Instrument |
 | 359,236 | Mar. 08, 1887 | W.R. Vogt | Spirit Level |
| | 360,536 | Apr. 05, 1887 | T.J. Megown | Leveling Instrument |
| | 360,837 | Apr. 05, 1887 | W.A. Wright | Leveling Instument |
 | 365,033 | Jun. 14, 1887 | O.D. Wood | Spirit Level |
 | 402,869 | May 07, 1889 | J.A. Traut | Sighting Attachment for Levels |
 | 405,624 | Jun. 18, 1889 | J.A. Traut | Sighting Attachment for Spirit-Levels |
