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| Patents for D. P. Foster | |||||
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| Number | Date | Patentee | Title | Type | |
| 13,897 | Dec. 04, 1855 | C.C. Tolman | Gimlet | gimlets | |
| 22,947 | Feb. 15, 1859 | D.P. Foster | Foster's Unyielding Grip Wrench | pipe and nut combination wrenches | |
| 33,063 | Aug. 13, 1861 | D.P. Foster | Saw set | saw sets | |