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