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* [http://w140.com/tek_fcp/tek_551_fac_cal.pdf Tektronix 551 Factory Calibration Procedure (PDF)] | * [http://w140.com/tek_fcp/tek_551_fac_cal.pdf Tektronix 551 Factory Calibration Procedure (PDF)] | ||
* [http://www.wellenkino.de/551 Martin Mehlhose's 551 Page] | * [http://www.wellenkino.de/551 Martin Mehlhose's 551 Page] | ||
* [[Media:070-245.pdf|Tektronix 551 Manual (PDF, OCR)]] | |||
}} | }} | ||
The '''Tektronix Type 551''', [[introduced in 1958]], | The '''Tektronix Type 551''', [[introduced in 1958]], | ||