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* [[Media:GRwiki Catalog E2 OCR 1928.pdf|E2 (1928)]], p.79 | * [[Media:GRwiki Catalog E2 OCR 1928.pdf|E2 (1928)]], p.79 | ||
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The '''General Radio 558 Amateur Band Frequency Meter''' was introduced in | The '''General Radio 558 Amateur Band Frequency Meter''' was introduced in {{Bulletin 930}} and {{Catalog E1}} / {{Catalog E2}}. | ||
The Type 558 is an absorption type wavemeter covering the five popular amateur radio bands. Its an improved version | The Type 558 is an absorption type wavemeter covering the five popular amateur radio bands. Its an improved version | ||