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| All Patents in class 33/273 | |||||
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| Number | Date | Patentee | Title | Type | |
| 51,675 | Dec. 26, 1865 | J.R. Abbott | Improvement in Combined Level, Square, Compass, and Plumb-Staff | levels | |
| 312,548 | Feb. 17, 1885 | J.W. Atkinson | L-Shaped Level | levels | |