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model=494 | | model=494 | | ||
class=Spectrum Analyzer | | class=Spectrum Analyzer | | ||
summary= | summary=21 GHz Spectrum Analyzer | | ||
image=Tek 494P 1.jpeg | | image=Tek 494P 1.jpeg | | ||
caption=Tektronix 494 | | caption=Tektronix 494 | |