Bell system practices plant series section 518 4 1 0 1 00 issue 6 november 1967 attco standard 6a key telephone system identification and installation. Bell system practices station operations manual major station systems section c7l 014 issue 4 february 1961 attco standard 6a key telephone system. Bell system practices at tco standard section 518 410 300 issue 3 december 1972 6a key telephone system selector only arrangement. 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. The bell system practices is a compilation of technical publications no 1 3 5 and 6 toil switchboards and no 6a key telephone systems
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