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| Patents for Robert S. Williams | |||||
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| Number | Date | Patentee | Title | Type | |
| 127,211 | May 28, 1872 | J.G. Aram | Improvement in machines for turning carriage-axles | carriage maker | |
| 372,806 | Nov. 08, 1887 | C. Kehr | Machine for turning irregular forms | pattern lathes | |