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* [[Media:GRwiki Catalog O OCR 1956.pdf|O (1956)]], p.31 | * [[Media:GRwiki Catalog O OCR 1956.pdf|O (1956)]], p.31 | ||
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The '''General Radio 1604-B Comparison Bridge''' was introduced in | The '''General Radio 1604-B Comparison Bridge''' was introduced in {{Catalog N}} and remained available through {{Catalog O}}. | ||
The General Radio 1604-B Comparison Bridge was introduced in 1954 Catalog N and remained available through Catalog O 1956. | The General Radio 1604-B Comparison Bridge was introduced in 1954 Catalog N and remained available through Catalog O 1956. |