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| All Patents in class 251/281 | |||||
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| Number | Date | Patentee | Title | Type | |
| 533,388 | Jan. 29, 1895 | H. Bolthoff | Register-valve | steam valves | |
| 1,872,626 | Aug. 16, 1932 | C.W. Goodrich, H. Ernst | Hydraulic Valve | hydraulic apparatus | |