000 | 003640000a22001330004500 | ||
---|---|---|---|
001 | EST | ||
003 | 621.395.65 / S32 / PCM T.S. | ||
004 | M | ||
006 | m | ||
100 | _aSiemens | ||
245 | _aThe introduction of PCM transmission systems and their influence on telecommunication networks | ||
650 | _a<CONMUTACION TELEFONICA><TELECOMUNICACIONES> | ||
999 |
_c15611 _d15611 |