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| All Patents in class 91/426 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,782,802 | Feb. 26, 1957 | B. Sassen | Hydraulic Control System | hydraulic apparatus | |
| 3,566,747 | Mar. 02, 1971 | C.W. Frame | Self-regulating expansion type control valve | drop hammers | |