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* [https://w140.com/tek_230_late.pdf Tektronix 230 Manual] (later version) | * [https://w140.com/tek_230_late.pdf Tektronix 230 Manual] (later version) | ||
* [https://w140.com/tek_readout_oscilloscopes_1968_catalog.pdf "Digital Readout Introduction" in 1968 Catalog] | * [https://w140.com/tek_readout_oscilloscopes_1968_catalog.pdf "Digital Readout Introduction" in 1968 Catalog] | ||
* [[Media:Tek r230 fcp sep 1967.pdf|Tektronix R230 Factory Calibration Procedure, September 1967]] | * [[Media:Tek r230 fcp sep 1967.pdf|Tektronix R230 Factory Calibration Procedure, September 1967]] |