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| All Patents in class 254/88 | |||||
| Picture | Number | Date | Patentee | Title | |
| 5,001,798 | Mar. 26, 1991 | H.F. Hamilton | Drive-on vehicle supporting arrangement | ||
| 5,544,861 | Aug. 13, 1996 | C.A. Wisner, J.C. Graham, T.F. Mandery | Adjustable riser-ramp assembly | ||