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| All Patents in class 74/5.37 | |||||
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| Number | Date | Patentee | Title | Type | |
| 238,631 | Mar. 08, 1881 | C.E. Ball | Dynamo or Magneto-Electric Machine | electric generators | |
| 1,309,489 | Jul. 08, 1919 | L.B. Sperry | Double-Gyro Inclinometer | inclinometers | |