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| All Patents in class 324/133 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,634,404 | Apr. 07, 1953 | T.F. Carmichael | Phase indicator | |
| 3,487,306 | Dec. 30, 1969 | W.D. Harmer | Instrument for Checking Energization of Solenoid Valves and Position of Valve Plunger | ||
| 6,512,361 | Jan. 28, 2003 | T.P. Becker | 14/42-Volt Automotive Circuit Tester | ||
| 6,577,116 | Jun. 10, 2003 | G.S. Wollert | Circuit Test Light | ||