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| Patents for Albert M. Hewitt | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 21,160 | Aug. 10, 1858 | W. Tucker | Variable-Boring Bit | |
 | 55,578 | Jun. 12, 1866 | D.W. Coggeshall | Improvement in Pipe-Wrenches | |