558-P: Difference between revisions

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|codes=UNION
|codes=UNION
|class=frequency standards and meters
|class=frequency standards and meters
|summary=frequency meter
|summary=Frequency meter
|image=GR 558-P Case Open.jpg
|image=GR 558-P Case Open.jpg
|caption=General Radio 558-P Amateur Band Frequency Meter
|caption=General Radio 558-P Amateur Band Frequency Meter