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* [http://w140.com/tek_r293.pdf Tektronix R293 Manual (PDF)] | * [http://w140.com/tek_r293.pdf Tektronix R293 Manual (PDF)] | ||
* [http://w140.com/tek_r293_description.pdf Description of R293 from Tektronix Automated Testing Systems book (PDF)] | * [http://w140.com/tek_r293_description.pdf Description of R293 from Tektronix Automated Testing Systems book (PDF)] | ||
* [http://w140.com/tek_r293_1968_catalog.pdf Tektronix R293 in 1968 Catalog (PDF)] | |||
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