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| All Patents in class 267/175 | |||||
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| Number | Date | Patentee | Title | Type | |
| 303,252 | Aug. 12, 1884 | H.G. Ashton | Safety Valves | steam safety valves | |
| 2,555,120 | May 29, 1951 | J.E. Delaney, A.H. Emery | Dial Snap Gauge | ||
| 2,732,747 | Jan. 31, 1956 | F.W. Livermont | Predetermined Torque Release Wrench and Spring Adjusting Means Therefor | ||