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| All Patents in class 248/180.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,092,867 | Apr. 14, 1914 | E.B. Sellew | Auxiliary support | work holding | |
| 2,940,784 | Jun. 14, 1960 | W.B. Fell | Precision threaded adjustment | machinist levels | |