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| All Patents in class 33/386 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,624,339 | Apr. 12, 1927 | O.D. Hapgood | Level | levels | |
| 2,206,817 | Jul. 02, 1940 | D.W. Mann | Precision Spirit Level | machinist levels | |