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| All Patents in class 137/338 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,145,977 | Feb. 07, 1939 | B.N. Foster | Solenoid actuated valve | metalworking machine mechanisms | |
| 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System | machine tool controls | |