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| All Patents in class 324/259 | |||||
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| Number | Date | Patentee | Title | Type | |
| 434,558 | Aug. 19, 1890 | R. Eickemeyer | Device for measuring the intensity of magnetic currents | ||
| 682,585 | Sep. 10, 1901 | J.W. Gardam, H.D. Cotter | Dipping-needle compass | ||