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| All Patents in class 192/97 | |||||
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| Number | Date | Patentee | Title | Type | |
| 150,765 | May 12, 1874 | J. Knowlson, Jr. | Improvement in rope-drums for windlasses | hoists, winches, come-alongs | |
| RE9,806 | Jul. 19, 1881 | J. Knowlson, Jr. | Rope-drum for windlasses | hoists, winches, come-alongs | |