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| All Patents in class 212/901 | |||||
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| Number | Date | Patentee | Title | Type | |
| 335,888 | Feb. 09, 1886 | W.F. Brian | Hay Derick | hay or straw lifters | |
| 5,076,448 | Dec. 31, 1991 | J.G. Ballard | Portable hydraulic crane | engine and transmission hoists | |