| 000 | 00572 a2200241 4500 | ||
|---|---|---|---|
| 001 | 281939 | ||
| 020 | _a | ||
| 041 | _aeng | ||
| 080 | _aDSBI 6450 : part - 1 : 1983 | ||
| 245 | _aPrivate branch exchanges for connection to the British telecommunications public switched telephone network : part - 1 : specification for general requirements | ||
| 250 | _a | ||
| 260 | _aLondon | ||
| 260 | _bBSI | ||
| 260 | _c1983 | ||
| 300 | _a22 p. | ||
| 300 | _c | ||
| 856 | _u | ||
| 490 | _aSBI 6450 : part - 1 : 1983 | ||
| 700 | _a | ||
| 650 | _a | ||
| 650 | _a | ||
| 942 | _cPP | ||
| 942 | _2UDC | ||
| 999 |
_c241676 _d241676 |
||