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* [[Media:GRwiki Catalog T OCR 1968.pdf|T (1968)]], p.70 | * [[Media:GRwiki Catalog T OCR 1968.pdf|T (1968)]], p.70 | ||
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The '''General Radio 1605-A Impedance Comparator''' was introduced in 1956 Catalog O and remained available through Catalog T 1968. | The '''General Radio 1605-A Impedance Comparator''' was introduced in 1956 Catalog O and remained available through Catalog T 1968. | ||