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| Patents for Robert Allison | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 58,568 | Oct. 09, 1866 | R. Allison | Improvement in boring-machines | |
 | 206,067 | Jul. 16, 1878 | R. Allison | Feed Screw and Nut For Rock Drills, etc. | |