| All Patents in class 33/388 |
Patents 1 -
15
of 59
      |
| Number | Date | Patentee | Title | Type |
| 4,611 | Jul. 02, 1846 | A. Girard | Plumb-Level | levels |
| 11,596 | Aug. 29, 1854 | L. Brooks | Inclinometer | inclinometers |
| 12,384 | Feb. 13, 1855 | H.W. Evans | Spirit Level | inclinometers |
| 20,943 | Jul. 20, 1858 | W.O. Fritschler | Carpenter's Rule | folding rules |
| 38,252 | Apr. 21, 1863 | F.A. Traut | Improvement in Combined Plumb and Levels | inclinometers |
| 44,225 | Sep. 13, 1864 | H.S. Shepardson | Improvement in Spirit-Levels | levels |
| 49,710 | Sep. 05, 1865 | R.T. Burnett | Replacable Level Vials | level adjustments |
| 56,013 | Jul. 03, 1866 | W.W. Cooper | Goniometer | goniometers |
| 65,726 | Jun. 11, 1867 | P. Clifford | Improvement in combined level and plumb | levels |
| 68,961 | Sep. 17, 1867 | L.L. Davis | Improvement in Adjustable Spirit Levels | metallic levels |
| 71,279 | Nov. 26, 1867 | P. Clifford | Improvement in Adjustable Spirit Levels | inclinometers |
| 72,159 | Dec. 17, 1867 | S.A. Bostwick | Plumb & Level | plumbs |
| 73,391 | Jan. 14, 1868 | H. Schüssler | Chain-Inclinometer | inclinometers |
| 84,880 | Dec. 15, 1868 | C.F. Hill | Spirit Level | spirit levels |
| 226,723 | Apr. 20, 1880 | F.C. Davidson | Clinometer | clinometers |
