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  "abstract": "A measuring device and an error calibration method for a machine tool. The measuring device includes a housing, a movable component, a calibration ball and a sensing switch. The housing has an inner space. The movable component is movably disposed in the inner space. The calibration ball is disposed on an end of the movable component and at least partially located outside the housing. The sensing switch is disposed in the inner space and configured to detect a movement of the movable component relative to the housing.",
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  "title": "Measuring device and error calibration method for machine tool using the same",
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