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* [http://w140.com/tek_661_factory_cal_proc.pdf Tektronix 661 Factory Calibration Procedure (PDF)] | * [http://w140.com/tek_661_factory_cal_proc.pdf Tektronix 661 Factory Calibration Procedure (PDF)] | ||
* http://w140.com/Nucl_Instrum_Methods_TD_Induct_effects_1968.pdf | * http://w140.com/Nucl_Instrum_Methods_TD_Induct_effects_1968.pdf | ||
* http://w140.com/ragsdale_661_1963.pdf | |||
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