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| All Patents in class 251/256 | |||||
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| Number | Date | Patentee | Title | Type | |
| 17,604 | Jun. 16, 1857 | D.N. Coffin, Jr. | Faucet | faucets | |
| 2,079,348 | May 04, 1937 | A.G. Hann | Valve | valves | |
| 2,301,041 | Nov. 03, 1942 | A.G. Hann | Valve Adjusting Means | flow controls | |
| 2,358,040 | Sep. 12, 1944 | C.M. Williams | Metering Valve | flow controls | |