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| All Patents in class 33/400 | |||||
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| Number | Date | Patentee | Title | Type | |
| 433,570 | Aug. 05, 1890 | N. Jensen | Plumb-level | inclinometers | |
| 632,182 | Aug. 29, 1899 | C.D. Hodge | Combined level, plumb, and inclinometer | inclinometers | |