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| All Patents in class 81/91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,570,991 | Oct. 09, 1951 | M.F. Stellinger | Self-adjusting wrench for nuts or like polygonal objects | self-adjust wrenches | |
| 2,647,425 | Aug. 04, 1953 | S.O. Mortensen | Self-adjusting wrench for nuts and like polygonal objects | self-adjust wrenches | |