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| All Patents in class 33/399 | |||||
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| Number | Date | Patentee | Title | Type | |
| 431,184 | Jul. 01, 1890 | R. Einstein | Plumb-Level | inclinometers | |
| 857,991 | Jun. 25, 1907 | W.A. Gibson | Combined Level and Plumb | inclinometers | |
| 1,533,975 | Apr. 14, 1925 | C.A. Dene | Gauge or leveling device for electric or other drills | handheld power tool accessories | |