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| All Patents in class 335/279 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,365,826 | Dec. 26, 1944 | W.S. Landon | Control Means | flow controls | |
| 2,494,491 | Jan. 10, 1950 | O.E. Rosaen | Ironclad Electromagnet with Pivoted Armature | electromagnets | |