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| Patents for M. P. Knowlton | |||||
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| Number | Date | Patentee | Title | Type | |
| 131,326 | Sep. 17, 1872 | G.D. Belcher | Improvement in the construction of hand-vises | vises | |
| 174,634 | Mar. 14, 1876 | I. Merrill | Extractor for Removing Cartridge-Shells | wrench combination tools | |