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| All Patents in class 33/348.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 794,753 | Jul. 18, 1905 | R.O. Stetson | Illuminated Spirit-Level | levels | |
| 857,891 | Jun. 25, 1907 | F.M. McLeroy | Plum-Level | levels | |
| 948,570 | Feb. 08, 1910 | E. Andersen | Spirit-Level | levels | |
| 1,001,206 | Aug. 22, 1911 | J.I. McCullough | Illuminated Spirit-Level | levels | |
| 1,098,039 | May 26, 1914 | A.W. Kibler, J.J. Pennington | Spirit-level | levels | |
| 1,121,329 | Dec. 15, 1914 | P.E. Curtis | Electric Light Attachment for Levels | wooden levels | |