| All Patents in class 33/389 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 363,998 | May 31, 1887 | G.P. Evelyn | Spirit-Level | inclinometers |
| 695,793 | Mar. 18, 1902 | M. Chamberlain | Setting Instrument | special purpose gauges |
| 756,628 | Apr. 05, 1904 | J. Happle | Level, Plumb, and Inclinometer | inclinometers |
| 824,109 | Jun. 26, 1906 | A.T. Gibson | Spirit-Level | inclinometers |
| 949,842 | Feb. 22, 1910 | H.H. Pugh | Level Device for Braces, &c. | levels |
| 1,752,112 | Mar. 25, 1930 | R.O. Stetson, C.D. Severance | Spirit level | levels |
| 4,559,714 | Dec. 24, 1985 | R.J. Wright | Pitch Measuring Apparatus | levels |
