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|series= | |series= | ||
|summary=Calibrator / source | |summary=Calibrator / source | ||
|image=Keithley | |image=Keithley 263 front.jpg | ||
|caption=Keithley | |caption=Keithley 263 | ||
|introduced= | |introduced=(?) | ||
|discontinued=(?) | |discontinued=(?) | ||
|designers= | |designers= |