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| All Patents in class 356/493 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,528,745 | Sep. 15, 1970 | E.E. Kirkham | Apparatus for Increasing the Frequency Response and Stability of a Light Detection System | machine tool controls | |
| 3,756,722 | Sep. 04, 1973 | T.A. Wetzel | Interferometric Measuring System | interferometers | |