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| All Patents in class 33/373 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 312,266 | Feb. 17, 1885 | W. Gurley | Rod-Plumbing Level | |
 | 331,144 | Nov. 24, 1885 | J.J. Lawler | Plumb-Bob for Gas-Fittings | |
 | 563,226 | Jun. 30, 1896 | W.D. Gardner | Shaft liner | |
| 903,011 | Nov. 03, 1908 | F. Schtabe | Level | ||
 | 960,718 | Jun. 07, 1910 | F. Schtabe | Level Attachment for Drills | |
 | 3,826,013 | Jul. 30, 1974 | B.H. Baher | Combinrd Level, Square and Plumb Tool | |