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| Patents for Ritter, Hogan & Sowden | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 70,788 | Nov. 12, 1867 | T. Birch, A. Sowden | Improvement in grinding machine for circular saws | |
 | 102,400 | Apr. 26, 1870 | P.J. Hogan | Improvement in detachable saw-teeth | |