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| All Patents in class 91/28 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 433,164 | Jul. 29, 1890 | F.W. Dean | Compound Engine | ||
| 1,940,668 | Dec. 26, 1933 | W. Ernst | Hydraulic Press Surge Control | ||
| 2,459,937 | Jan. 25, 1949 | H. Ernst, F.A. Hassman | Hydraulic Control System | ||