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| All Patents in class 91/430 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,083,774 | Jun. 15, 1937 | J.C. Campbell | Sensitive Valve Mechanism | hydraulic apparatus | |
| 4,526,000 | Jul. 02, 1985 | A.C. Saurwein | Pressure Intensifier | water jet cutting apparatus | |