| All Patents in class 33/375 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 68,961 | Sep. 17, 1867 | L.L. Davis | Improvement in Adjustable Spirit Levels | metallic levels |
| 168,567 | Oct. 11, 1875 | S. Holbrook | Railway Track-Gage | track gauges |
| 423,484 | Mar. 18, 1890 | W. Martin | Inclinometer | inclinometers |
| 517,935 | Apr. 10, 1894 | A. Schnell | Spirit Level Attachment | levels |
| 570,056 | Oct. 27, 1896 | C.F. Richardson | Spirit Level | levels |
| 596,279 | Dec. 28, 1897 | C.M. Potter | Level | levels |
| 691,631 | Jan. 21, 1902 | J.H. Jackson | Spirit Level | line levels |
| 1,202,167 | Oct. 24, 1916 | E.W. Daab | Level | levels |
| 1,219,430 | Mar. 20, 1917 | A.W. Bjornstad | Instrument for Use in Topography | calipers |
| 1,263,229 | Apr. 16, 1918 | G.G. Gordon | Grader's Guide | measurement gauges |
| 1,702,689 | Feb. 19, 1929 | S.O. Duemler | Hammer Level | levels |
| 2,602,240 | Jul. 08, 1952 | . | Combined Handsaw and Gauge | |
| 2,761,217 | Sep. 04, 1956 | H. King | Machine Alignment Detector | measuring tools |
