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| All Patents in class 359/439 | |||||
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| Number | Date | Patentee | Title | Type | |
| 427,022 | Apr. 29, 1890 | E. Weston | Electrical Measuring Instrument | electrical measuring apparatus | |
| 2,959,087 | Nov. 08, 1960 | W.P. Strickland, Jr. | Precision optical measuring device | milling machine accessories | |