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| All Patents in class 33/349 | |||||
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| Number | Date | Patentee | Title | Type | |
| 310,154 | Dec. 30, 1884 | B.F. Tyler | Spirit Level | levels | |
| 356,645 | Jan. 25, 1887 | H.N. Jasper | Akron Spirit Level | levels | |
| 370,013 | Sep. 13, 1887 | O.B. Fuller | Pendulum Level | pendulum levels | |
| 383,196 | May 22, 1888 | C.M. Stratton, E.A. Stratton | Spirit Level | levels | |