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558: Difference between revisions
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|image=GR 558 Case Open A.jpg | |image=GR 558 Case Open A.jpg | ||
|caption=General Radio 558 Amateur Band Frequency Meter | |caption=General Radio 558 Amateur Band Frequency Meter | ||
|series= | |series=558 | ||
|introduced=1928 | |introduced=1928 | ||
|discontinued=1929 | |discontinued=1929 | ||