720-A: Difference between revisions

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|model=720-A
|model=720-A
|class=frequency standards and meters
|class=frequency standards and meters
|summary=frequency meter
|summary=Frequency Meter
|image=GR 720-A Close-up.jpg
|image=GR 720-A Close-up.jpg
|caption=General Radio 720-A Frequency Meter
|caption=General Radio 720-A Frequency Meter
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