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| All Patents in class 417/199.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,459,937 | Jan. 25, 1949 | H. Ernst, F.A. Hassman | Hydraulic Control System | hydraulic apparatus | |
| 2,766,693 | Oct. 16, 1956 | C.B. Wells | Pump | ||
| 2,892,413 | Jun. 30, 1959 | R.W. Erikson | Anti-hum device | ||