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| All Patents in class 220/293 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,488,770 | Nov. 22, 1949 | A.K. Foulds | Cover Locking and Actuating Means for Fluid Control Devices | flow controls | |
| 2,722,337 | Nov. 01, 1955 | G.W. Lindsay | Closure member | ||