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| All Patents in class 251/129.11 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,284,781 | Jun. 02, 1942 | W.H. Ward | Hopper | ||
| 4,789,001 | Dec. 06, 1988 | L.W. Durham, B.S. Backe | Operating System for a Valve | ||