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| All Patents in class 33/380 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 726,377 | Apr. 28, 1903 | J.A. Traut | Level | |
| 2,206,003 | Jun. 25, 1940 | E.B. Donnell | Inclinometer | ||
 | 2,211,201 | Aug. 13, 1940 | W.B. Fell | Machinist's precision level | |