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* [[Media:070-245.pdf|Tektronix 551 Manual (PDF, OCR)]] | * [[Media:070-245.pdf|Tektronix 551 Manual (PDF, OCR)]] | ||
* [[Media:tek_551_fcp.pdf|Tektronix 551 Factory Calibration Procedure (PDF, OCR)]] | |||
}} | }} | ||
The '''Tektronix Type 551''', [[introduced in 1958]], | The '''Tektronix Type 551''', [[introduced in 1958]], |
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