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| All Patents in class 212/203 | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,710 | Jul. 07, 1868 | S.K. Wellman | Hydraulic Jack | cranes | |
| 374,756 | Dec. 13, 1887 | W.H. Ridgway | Crane | jib cranes | |
| 411,681 | Sep. 24, 1889 | W.H. Ridgway | Crane | jib cranes | |