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| Patents for John Knowlson Jr. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 150,765 | May 12, 1874 | J. Knowlson, Jr. | Improvement in rope-drums for windlasses | |
 | RE9,806 | Jul. 19, 1881 | J. Knowlson, Jr. | Rope-drum for windlasses | |