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| All Patents in class 324/138 | |||||
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| Number | Date | Patentee | Title | Type | |
| 714,973 | Dec. 02, 1902 | M.E. Thompson | Measuring Alternating Currents | electrical measuring apparatus | |
| 715,220 | Dec. 02, 1902 | M.E. Thompson | Means of Measuring Alternating Electric Currents | electric meters | |