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|model=720-A | |model=720-A | ||
|class=frequency standards and meters | |class=frequency standards and meters | ||
|summary= | |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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