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| All Patents in class 91/367 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,722,889 | Nov. 08, 1955 | G.A. Wahlmark | Servo-type control for pumps | ||
| 2,807,240 | Sep. 24, 1957 | E.G. Roehm | Automatic Compensating Mechanism for Milling Machine | metalworking machine mechanisms | |