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| Patents for J. M. Colgan | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 109,178 | Nov. 15, 1870 | J.C. Clime | Improvement in sawing-machines | |
 | 110,705 | Jan. 03, 1871 | T. Welham | Improvement in Saws | |
 | 116,134 | Jun. 20, 1871 | J. Yocom, Jr. | Improvement in split castings | |
 | 629,236 | Jul. 18, 1899 | J. Carr | Tool Holder for Metal Working Machines | |