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| All Patents in class 91/402 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,805,588 | May 19, 1931 | R.E. Manley | Hydraulic jack | |
| 1,870,499 | Aug. 09, 1932 | W. Ernst | Hydraulically Operated Drop Hammer | ||
 | 2,431,619 | Nov. 25, 1947 | E.C. Read | Steam engine with keyed connection between piston rod and crosshead | |
 | 4,077,608 | Mar. 07, 1978 | R.H. Nehrig | Hydraulic hand jack | |