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| All Patents in class 251/170 | |||||
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| Number | Date | Patentee | Title | Type | |
| 533,388 | Jan. 29, 1895 | H. Bolthoff | Register-valve | steam valves | |
| 2,055,232 | Sep. 22, 1936 | R.C. Anderson, C.L. Hardy | Valve | fire engines | |