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| All Patents in class 33/370 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 787,940 | Apr. 25, 1905 | A.J. Perks | Spirit level attachment for straight edges | |
| 909,846 | Jan. 12, 1909 | W.N. Cavileer | Plumb Bob and Chalk Line Holder | ||
 | 948,777 | Feb. 08, 1910 | U. Tuomi | Combined Square, Level, and Plumb | |
| 970,360 | Sep. 13, 1910 | W.H. Whigham | Angle guide attachment for boring-tools | ||
 | 1,263,229 | Apr. 16, 1918 | G.G. Gordon | Grader's Guide | |
 | 1,426,645 | Aug. 22, 1922 | H.C. Hornbeck | Inclinometer | |
 | 1,435,054 | Nov. 07, 1922 | H.C. Drummond | Spirit-Level and Plumb | |