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| All Patents in class 91/38 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,978,346 | Oct. 23, 1934 | C.W. Goodrich, H. Ernst | Delayed Trip for Hydraulic Circuits | ||
| 2,375,255 | May 08, 1945 | M.A. Mathys, I.J. Snader | Hydraulic Transmission for Machine Tools | ||