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| All Patents in class 324/99D | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,564,406 | Feb. 16, 1971 | R. Zechlin, J.G. Green, R.M. Henderson | Measuring and Conversion System | electrical measuring apparatus | |
| 3,728,626 | Apr. 17, 1973 | H.C. Thomas, A.T. Douglas | Electronic Measuring System | electrical measuring apparatus | |
| 4,926,360 | May 15, 1990 | S.T. Spink, Jr. | Electronic Gage Amplifier and Display | ||