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| All Patents in class 324/122 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 514,973 | Feb. 20, 1894 | N. Tesla | Electrical Meter | ||
| 1,041,061 | Oct. 15, 1912 | A. Frisch | Indicating Mechanism | ||
| 2,644,131 | Jun. 30, 1953 | W.R. Elwell, G.M. Walraven | Timing Indicator for Internal Combustion Engines | ||
| 5,412,312 | May 02, 1995 | R.D. Braun, M.M. Crass | Frequency and Instantaneous Voltage Level Meter | ||