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| Patents for William Rollins | |||||
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| Number | Date | Patentee | Title | Type | |
| 162,044 | Apr. 13, 1875 | E.M. Dudgeon | Improvement in hydraulic jacks | hydraulic jacks | |
| RE6,786 | Dec. 07, 1875 | E.M. Dudgeon | Improvement in hydraulic jacks | hydraulic jacks | |