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| All Patents in class 324/115 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 392,386 | Nov. 06, 1888 | E. Weston | Electrical Measuring Apparatus | |
 | 392,387 | Nov. 06, 1888 | E. Weston | Electrical Measuring Apparatus | |
 | 427,022 | Apr. 29, 1890 | E. Weston | Electrical Measuring Instrument | |
| 2,780,800 | Feb. 05, 1957 | M.T. Thorsson, L.J. Lauler | Remote Indicator for Scales | ||
| 5,412,312 | May 02, 1995 | R.D. Braun, M.M. Crass | Frequency and Instantaneous Voltage Level Meter | ||