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* [http://w140.com/tek_520.pdf Tektronix 520 Manual (PDF)] | * [http://w140.com/tek_520.pdf Tektronix 520 Manual (PDF)] | ||
* [http://w140.com/tek_520a.pdf Tektronix 520A Manual (PDF)] | * [http://w140.com/tek_520a.pdf Tektronix 520A Manual (PDF)] | ||
* [[Media:Tek 520 pal fcp sept 1968.pdf]] | |||
* [http://w140.com/tek_520_cat.pdf Tektronix 520 Entry in 1968 Catalog (PDF)] | * [http://w140.com/tek_520_cat.pdf Tektronix 520 Entry in 1968 Catalog (PDF)] |