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| All Patents in class 254/93A | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,395,340 | Nov. 01, 1921 | F.L. Gormley | Speed Retarding Device for Lifting Jacks | lifting tools | |
| 2,831,551 | Apr. 22, 1958 | W.A. Ross, I.A. Weaver | Safety device for lifting jacks | vehicle mechanic | |