| All Patents in class 33/375 |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
 | 68,961 | Sep. 17, 1867 | L.L. Davis | Improvement in Adjustable Spirit Levels |
 | 168,567 | Oct. 11, 1875 | S. Holbrook | Railway Track-Gage |
 | 423,484 | Mar. 18, 1890 | W. Martin | Inclinometer |
| | 517,935 | Apr. 10, 1894 | A. Schnell | Spirit Level Attachment |
 | 570,056 | Oct. 27, 1896 | C.F. Richardson | Spirit Level |
 | 596,279 | Dec. 28, 1897 | C.M. Potter | Level |
 | 691,631 | Jan. 21, 1902 | J.H. Jackson | Spirit Level |
 | 1,202,167 | Oct. 24, 1916 | E.W. Daab | Level |
 | 1,219,430 | Mar. 20, 1917 | A.W. Bjornstad | Instrument for Use in Topography |
 | 1,263,229 | Apr. 16, 1918 | G.G. Gordon | Grader's Guide |
