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| Patents for John P. Marshall | |||||
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| Number | Date | Patentee | Title | Type | |
| 13,221 | Jul. 10, 1855 | B.F. Joslyn | Slide-Wrench | nut wrenches | |
| 16,733 | Mar. 03, 1857 | B.F. Joslyn | Improvement in Screw-Wrenches | nut wrenches | |