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| All Patents in class 33/381 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,738,791 | Dec. 10, 1929 | G.R. Ober | Level | wooden levels | |
| 1,752,112 | Mar. 25, 1930 | R.O. Stetson, C.D. Severance | Spirit level | levels | |
| 1,777,429 | Oct. 07, 1930 | R.C. Charlton | Level | metallic levels | |
| 1,884,469 | Oct. 25, 1932 | . | Combination Handsaw | ||
| 2,240,807 | May 06, 1941 | H. Shaw | Spirit and like levels | spirit levels | |
| 2,761,215 | Sep. 04, 1956 | L.A. Macklanburg | Squar-evel | levels | |