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| All Patents of Type: transportation | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,708,048 | May 10, 1955 | F.P. Hopfeld | Handling equipment for barrels or the like | transportation | |
| 2,948,363 | Aug. 09, 1960 | F.P. Hopfeld | Telescoping elevators | transportation | |
| 3,360,078 | Dec. 26, 1967 | F.P. Hopfeld | Lifts | transportation | |