| All Patents in class 33/386 |
Patents 1 -
15
of 17
      |
| Number | Date | Patentee | Title | Type |
| 60,788 | Jan. 01, 1867 | W.L. Richardson | Sighting Level | levels |
| 68,603 | Sep. 10, 1867 | A. Stanley, S.N. Chapin | Improvement in Adjusting Spirit Levels | wooden levels |
| 73,670 | Jan. 21, 1868 | W.J. Tate | Improvement in Adjustable Spirit Levels | levels |
| 128,513 | Jul. 02, 1872 | J.A. Traut | Improvement in Spirit Levels | levels |
| 288,624 | Nov. 20, 1883 | L.L. Davis | Spirit Level and Plumb | metallic levels |
| 353,846 | Dec. 07, 1886 | G. Cook | Spirit Level | levels |
| 421,786 | Feb. 18, 1890 | J.A. Traut | Spirit Level | levels |
| 423,094 | Mar. 11, 1890 | E.H. Taylor | Apparatus for Leveling and Marking Shafts | metallic levels |
| 465,882 | Dec. 29, 1891 | C.E. Peterson | Spirit-Level | wooden levels |
| 523,023 | Jul. 17, 1894 | J.A. Traut | Level | levels |
| 662,925 | Dec. 04, 1900 | S. Fierbaugh | Track Gage | track gauges |
| 794,175 | Jul. 11, 1905 | A.P. Hall | Adjustable Level and Incinometer | inclinometers |
| 820,028 | May 08, 1906 | J.A. Traut | Level | level adjustments |
| 825,320 | Jul. 10, 1906 | E.G. Hewitt | Spirit-Level | levels |
| 1,515,239 | Nov. 11, 1924 | H.J. Cook | Spirit Level | levels |
