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| All Patents in class 251/250 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 164,219 | Jun. 08, 1875 | J.H. McNamar, R. Scheidler | Throttle Valve | |
 | 2,319,964 | May 25, 1943 | F.C. Wilson | Hydraulic press | |