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* [[Media:Tek 21 and 31 prelim.pdf|Tektronix 21 and 31 Preliminary Manual]] | * [[Media:Tek 21 and 31 prelim.pdf|Tektronix 21 and 31 Preliminary Manual]] | ||
* [https://w140.com/tek_21_31_calc_interfacing.pdf Tektronix 21 and 31 calculators interfacing information] | * [https://w140.com/tek_21_31_calc_interfacing.pdf Tektronix 21 and 31 calculators interfacing information] | ||
* [[Media:Tek 21 31 calculator interface preliminary.pdf|Tektronix 21 and 31 Preliminary Interfacing Manual]] | * [[Media:Tek 21 31 calculator interface preliminary.pdf|Tektronix 21 and 31 Preliminary Interfacing Manual]] | ||
* [[Media:070-1575-00.pdf|Tektronix 31 Operators Manual]] (OCR) | * [[Media:070-1575-00.pdf|Tektronix 31 Operators Manual]] (OCR) | ||
* [[Media:P7001_Calculator_Aided_Measurements.pdf|P7001/31 Calculator Aided Measurements]] | * [[Media:P7001_Calculator_Aided_Measurements.pdf|P7001/31 Calculator Aided Measurements]] |