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| All Patents in class 217/69 | |||||
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| Number | Date | Patentee | Title | Type | |
| 100,463 | Mar. 01, 1870 | C.M. Stratton, E.A. Stratton | Improvement in Spirit Level | wooden levels | |
| 370,826 | Oct. 04, 1887 | E.A. Stratton, C.M. Stratton | Spirit Level Stock | wooden levels | |