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| All Patents in class 251/231 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,255,370 | Feb. 05, 1918 | A.W. Wheaton | Self Closing Faucet and Wrench or Handle Therefore | auxiliary wrenches | |
| 2,269,395 | Jan. 06, 1942 | G.R. True, E.J. Dillman | Refrigeration Control Apparatus | refrigeration apparatus | |