Bell system practices western electric telephones and equipment file naming conventions name size description parent directory 518 000 000 i58 1983 05 01pdf 278k numerical index key telephone systems video sstations and switching systems customer and 6a key telephone systems 518 010 116 i01 1978 12 01pdf 333k 278a paging . The 1a2 key telephone system is a business telephone system developed and distributed by the western electric company for the bell system the 1a2 key telephone system was a modular system that provided flexible solutions for a variety of telephone service requirements. Bell system practices station operations manual major station systems section c7l 014 issue 4 february 1961 attco standard 6a key telephone system two talking link connections 1 00 introduction 1 01 this section covers the installation of the two talking link 6a key telephone system it contains wiring charts. The bell system practices bsps is a compilation of technical publications which describes the best methods of engineering constructing installing and maintaining the telephone plant of the bell system under direction of att and bell telephone laboratories. The bell system practices were a set of documents produced by the american telephone and telegraph company to instruct employees on the proper use and maintenance of all kinds of telephone equipment
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