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| All Patents in class 91/418 | |||||
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| Number | Date | Patentee | Title | Type | |
| 367,784 | Aug. 09, 1887 | J.S. Brown | Attachment for Engines | steam engines | |
| 2,782,802 | Feb. 26, 1957 | B. Sassen | Hydraulic Control System | hydraulic apparatus | |