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