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| All Patents in class 137/341 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System | machine tool controls | |
| 2,565,522 | Aug. 28, 1951 | W.S. Renier | Molding Machine | plastic molding machines | |