000 | 003030000a22001090004500 | ||
---|---|---|---|
245 | _aTelecommunication systems : case study of an experimental telephone exchange | ||
110 | _aOpen University | ||
260 |
_aMilton Keynes _bOpen University _c1976 |
||
080 |
_a621.39 _bO6 |
||
041 | _aEN | ||
942 | _cBK | ||
999 |
_c110712 _d110712 |