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| All Patents in class 356/620 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,884,889 | Dec. 05, 1989 | W.L. Beckwith, Jr. | Calibration System for Coordinate Measuring Machine | coordinate measuring machines | |
| 4,939,678 | Jul. 03, 1990 | W.L. Beckwith, Jr. | Method for Calibration of Coordinate Measuring Machine | coordinate measuring machines | |