| 000 | 003430000a22001210004500 | ||
|---|---|---|---|
| 245 | _aPneumatic tubes and telegram conveyors | ||
| 260 |
_aLondon _bG.P.O. |
||
| 300 | _a24 p., ill. | ||
| 500 | _areproduced from the " post office electrical engineers jouranl with the amendments" | ||
| 080 |
_a621.867.8 _bP6 |
||
| 041 | _aEN | ||
| 942 | _cBK | ||
| 999 |
_c94828 _d94828 |
||