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| All Patents in class 418/3 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,006,896 | Oct. 24, 1911 | B.F. Augustine | Rotary Engine | |
| 2,441,339 | May 11, 1948 | S.A. Rivington | Hydraulic system | ||
| 2,766,693 | Oct. 16, 1956 | C.B. Wells | Pump | ||
| 2,892,413 | Jun. 30, 1959 | R.W. Erikson | Anti-hum device | ||