| All Patents in class 33/385 |
Patents 1 -
15
of 29
      |
| Number | Date | Patentee | Title | Type |
| 17,870 | Jul. 28, 1857 | C. Cole | Adjustment Applied to Pendulum Levels | level adjustments |
| 36,906 | Nov. 11, 1862 | T.N. Hosmer | Improvement in Spirit-Levels | level adjustments |
| 71,279 | Nov. 26, 1867 | P. Clifford | Improvement in Adjustable Spirit Levels | inclinometers |
| 75,534 | Mar. 17, 1868 | L.L. Davis | Improvement in Adjustable Spirit Levels | levels |
| 82,769 | Oct. 06, 1868 | J.A. Traut | Improvement in Adjusting Spirit Levels | levels |
| 114,027 | Apr. 25, 1871 | F.B. Abel, J. Morss | Improvement in Adjustable Spirit Levels | levels |
| 121,088 | Nov. 21, 1871 | L.L. Davis | Improvement in Spirit Levels | wooden levels |
| 178,354 | Jun. 06, 1876 | M. Wilcox | Improvement in Spirit Levels | levels |
| 201,276 | Mar. 12, 1878 | J. Morss | Improvement in Spirit Level and Plumb | wooden levels |
| 297,574 | Apr. 29, 1884 | L.L. Davis | Spirit Level | metallic levels |
| 372,921 | Nov. 08, 1887 | C.B. Long | Spirit Level | machinist levels |
| 544,587 | Aug. 13, 1895 | W. Moore | Plumb and Level | levels |
| 565,096 | Aug. 04, 1896 | J.A. Traut | Apparatus for Adjusting Spirit Levels | levels |
| 565,097 | Aug. 04, 1896 | J.A. Traut | Level | metallic levels |
| 778,130 | Dec. 20, 1904 | D.A. James | Eclipse Level | levels |
