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| All Patents in class 340/671 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,816,187 | Dec. 10, 1957 | A.E. Smith | Indicating Device | ||
| 3,040,215 | Jun. 19, 1962 | W. Whitehouse, E.B. Farmer | Shaft Rotation Senser | ||