https://proaudiodesignforum.com/images/ ... s_1958.pdfThis is one of a series of Engineering Reference Data Bulletins containing information on apparatus designed by the Bell Telephone Laboratories, Incorporated, for other than Military Applications, and manufactured by the Western Electric Company or by other suppliers in accordance with specifications prepared by the Laboratories. Up-to-date information on coded Transmission Transformers is presented in this bulletin; it partly replaces "Reference Data - Coils and Transformers," issued in May, 1947. The specific types described are Auto Transformers, Induction Coils, Input and Output Transformers, Repeating Coils, and Transformers (transmission type). It is intended for use primarily by engineers of the Laboratories and contains information on apparatus which may be rated AT&T Co.
Western Electric Bell System Transformer Catalog 1958
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Western Electric Bell System Transformer Catalog 1958
Western Electric Bell System Transformer Catalog 1958