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| All Patents in class 251/236 | |||||
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| Number | Date | Patentee | Title | Type | |
| 10,800 | Apr. 18, 1854 | R.M. Bouton | Faucet | faucets | |
| 666,026 | Jan. 15, 1901 | C.B. Richards | Throttle Valve | gas and liquid valves | |
| 2,849,206 | Aug. 26, 1958 | A.P. Waterson | Hydraulic tracer control valve | machine tool controls | |