| 000 | 00396 a2200157 4500 | ||
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| 020 | _a1853562531 | ||
| 082 |
_a621.38 _bHAS |
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| 100 |
_aNational Extension College _933976 |
||
| 245 |
_aSwitching systems n ii _bmodule c: |
||
| 260 |
_aCambridge: _bNational Extension College, _c1992. |
||
| 300 | _a64p | ||
| 500 | _aPB | ||
| 546 | _aEng | ||
| 650 |
_aDigital communication _977496 |
||
| 942 | _cBK | ||
| 999 |
_c54544 _d54544 |
||