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| Patents for United States of America | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,480,208 | Aug. 30, 1949 | L.W. Alvarez | Radio distance and direction indicator | |
 | 2,727,418 | Dec. 20, 1955 | C.W. Moon | Reinforced Wrench | |