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| All Patents in class 14/71.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 568,421 | Sep. 29, 1896 | J. Weeks | Dock and vessel leveling device | ||
| 4,845,792 | Jul. 11, 1989 | A.J. Dingolecki, D.J. Caldwell, G.R. Bakula | Two-Part Adjustable Approach Ramp | ||