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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 1928 Bulletin 930 | The '''General Radio 558 Amateur Band Frequency Meter''' was introduced in 1928 Bulletin 930 and Catalogs E1 and E2. | ||
==Specifications== | ==Specifications== | ||