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| All Patents in class 174/117F | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,150,022 | Aug. 17, 1915 | A.B. Field | Coil-wedge | induction motors | |
| 3,696,412 | Oct. 03, 1972 | R.I. Swanson | Method and Means for Indicating Tension | ||