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| All Patents in class 254/84 | |||||
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| Number | Date | Patentee | Title | Type | |
| 923,593 | Jun. 01, 1909 | C.G. Sprado | Crane | cranes | |
| 2,831,551 | Apr. 22, 1958 | W.A. Ross, I.A. Weaver | Safety device for lifting jacks | vehicle mechanic | |