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558-P: Difference between revisions
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|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 | ||
|series= | |series=558 | ||
|introduced=1930 | |introduced=1930 | ||
|discontinued=1931 | |discontinued=1931 | ||