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| All Patents in class 91/226 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,607,559 | Aug. 19, 1952 | E.H. Forss | Valve for pneumatic riveting hammers | |
| 2,642,848 | Jun. 23, 1953 | R.G. Knudsen, G.M. Walraven | Air Valve Mechanism for Controling the Operation of Pneumatic Devices and the Like | ||