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| All Patents in class 324/106 | |||||
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| Number | Date | Patentee | Title | Type | |
| 307,031 | Oct. 21, 1884 | T.A. Edison | Electrical indicator | rectifiers | |
| 1,996,943 | Apr. 09, 1935 | D.D. Wile | Fluid Measuring Device | electrical measuring apparatus | |
| 2,033,318 | Mar. 10, 1936 | H. Abramson | Indicator gear for measuring instruments and the like | special measuring tools | |