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| All Patents in class 91/422 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,321,264 | Jun. 08, 1943 | H.H. Turner | Fluid-Pressure Operated Mechanism | ||
 | 5,237,916 | Aug. 24, 1993 | L. Malashenko | Regenerative hydraulic cylinders with internal flow paths | |