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| All Patents in class 187/231 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,560,131 | Jul. 10, 1951 | F.P. Hopfeld, A.M. Sasgen | Hand truck with elevator platform | pallet jacks, forklifts, elevating trucks | |
| 3,052,323 | Sep. 04, 1962 | F.P. Hopfeld | Lift truck | pallet jacks, forklifts, elevating trucks | |