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| All Patents in class 33/333 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 168,933 | Oct. 19, 1875 | H. Stanley | Improvement in handles for boring tools | |
 | 420,242 | Jan. 28, 1890 | C.E. Nielsen | Plumb Level | |
| 426,696 | Apr. 29, 1890 | W.M. Washburn | Farmer's Level | ||
 | 1,130,552 | Mar. 02, 1915 | E.A. Trenholm | Spirit Level | |
 | 1,255,644 | Feb. 05, 1918 | D.D. Roth | Protractor-level for drills and other tools | |
| 1,533,975 | Apr. 14, 1925 | C.A. Dene | Gauge or leveling device for electric or other drills | ||