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| All Patents in class 417/222.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,383,092 | Aug. 21, 1945 | G.A. Wahlmark | Hydraulic circuit | ||
| 2,722,889 | Nov. 08, 1955 | G.A. Wahlmark | Servo-type control for pumps | ||
| 2,731,569 | Jan. 17, 1956 | S.J. L, J.S. Cardillo, M.M. Hann, F.G. Lundgard | Hydraulic transmission and control | ||
| 2,769,393 | Nov. 06, 1956 | J.S. Cardillo, M.M. Hann | Hydraulic pump and control | ||
| 2,888,806 | Jun. 02, 1959 | K.A. Teumer | Control system | ||