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* [http://w140.com/tek_240_r250_description.pdf 240 and R250 Description from Tektronix Automated Testing Systems book (PDF)]
* [http://w140.com/tek_240_r250_description.pdf 240 and R250 Description from Tektronix Automated Testing Systems book (PDF)]
* [[Media:Tek 240-250 fcp april 1969.pdf|Tektronix 240-250 Factory Calibration Procedure, April 1969 (PDF, needs OCR)]]


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