| All Patents in class 33/391 |
Patents 1 -
15
of 27
      |
| Number | Date | Patentee | Title | Type |
| 9,722 | May 17, 1853 | T.A. Chandler | Pendulum Level | inclinometers |
| 17,023 | Apr. 14, 1857 | T.A. Chandler | Pendulum Level or Inclinometer | inclinometers |
| 39,124 | Jul. 07, 1863 | D.G. Davidson, E. Pullen, J.S. Davidson | Plumb, Level, and Square | plumbs |
| 40,428 | Oct. 27, 1863 | W.H. Polleys, D.D. Polleys | Improvement in Plumb-Levels | inclinometers |
| 49,037 | Jul. 25, 1865 | B.G. Martin | Improvement in Carpenters' Rules | rule accessories |
| 49,802 | Sep. 05, 1865 | B.F. St. John | Improvement in Pendulum Levels | pendulum levels |
| 51,564 | Dec. 19, 1865 | G. Cuppers | Inclinometer | inclinometers |
| 53,795 | Apr. 10, 1866 | M.W. Doran | Improvement in Plumb-Levels | pendulum levels |
| 72,740 | Dec. 31, 1867 | J.L. Knox | Clinometers & Levels | wooden levels |
| 371,294 | Oct. 11, 1887 | G. Woods | Plumb Level for Boring Bits | levels |
| 416,683 | Dec. 03, 1889 | W.B. Melick | Clinometer | inclinometers |
| 420,242 | Jan. 28, 1890 | C.E. Nielsen | Plumb Level | inclinometers |
| 441,772 | Dec. 02, 1890 | K. Miller | Plumb-Level | pendulum levels |
| 449,557 | Mar. 31, 1891 | B.A. Mounts | Inclinometer | inclinometers |
| 597,886 | Jan. 25, 1898 | H.S. Minot | Plumb Level | inclinometers |
