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| All Patents in class 91/499 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,383,429 | Aug. 21, 1945 | G.A. Wahlmark | Hydraulically operated control mechanism | ||
| 2,520,632 | Aug. 29, 1950 | J. Greenhut | Hydraulic pump or motor | ||
| 2,722,889 | Nov. 08, 1955 | G.A. Wahlmark | Servo-type control for pumps | ||
| 2,892,413 | Jun. 30, 1959 | R.W. Erikson | Anti-hum device | ||