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| All Patents in class 251/205 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,281,566 | May 05, 1942 | L.W. Eggleston | Air Vent Valve | ||
 | 2,526,361 | Oct. 17, 1950 | C. Johnson | Control valve for fluid servomotors | |
 | 3,067,768 | Dec. 11, 1962 | J.L. Burg | Temperature compensated hydraulic control device | |
| 4,416,338 | Nov. 22, 1983 | R.R. Zuzinec, J.W. Nelson, M.L. Foster | Control Mechanism for a Pneumatic Tool | ||