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* [[Media:Tek_491_Catalog_Spec_1979.pdf| Tektronix 491 Final Spec (PDF, OCR)]] | * [[Media:Tek_491_Catalog_Spec_1979.pdf| Tektronix 491 Final Spec (PDF, OCR)]] | ||
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NOTE: Due to severe performance limitations, it was replaced by the completely redesigned 492 in 1980 | NOTE: Due to severe performance limitations, it was replaced by the completely redesigned 492 in 1980 | ||
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