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| All Patents in class 324/146 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 413,292 | Oct. 22, 1889 | E. Thomson | Electric measuring-instrument | |
 | 427,022 | Apr. 29, 1890 | E. Weston | Electrical Measuring Instrument | |
| 434,558 | Aug. 19, 1890 | R. Eickemeyer | Device for measuring the intensity of magnetic currents | ||