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| All Patents in class 251/321 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,198,070 | Apr. 23, 1940 | D.D. Wile | Pressure Valve | ||
 | 2,607,559 | Aug. 19, 1952 | E.H. Forss | Valve for pneumatic riveting hammers | |
 | 2,626,464 | Jan. 27, 1953 | M. Mennesson | Micrometer | |