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* [[Media:Tek 561a field recal proc sep 1962.pdf | Tektronix 561A Field Recalibration Procedure, September 1962]] (needs OCR) | * [[Media:Tek 561a field recal proc sep 1962.pdf | Tektronix 561A Field Recalibration Procedure, September 1962]] (needs OCR) | ||
* [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure]] (needs OCR) | * [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure]] (needs OCR) | ||
* [[Media:Tek 561s fcp jan 1964.pdf | Tektronix 561S Factory Calibration Procedure, January 1964]] | * [[Media:Tek 561s fcp jan 1964.pdf | Tektronix 561S Factory Calibration Procedure, January 1964]] | ||
'''Modifications''' | '''Modifications''' |