| 000 | 00386cam a2200145ua 4500 | ||
|---|---|---|---|
| 003 | OSt | ||
| 008 | 250106b |||||||| |||| 00| 0 eng d | ||
| 041 | _aeng | ||
| 082 |
_a621.38151 _bWIT/TH |
||
| 100 |
_aWitts, Alfred T. _96812 |
||
| 245 | _aThermionic valve in modern radio receivers / | ||
| 260 |
_aLondon : _bSir Isaac Pitman & Sons Ltd , _c1947. |
||
| 300 | _a218 ; . | ||
| 942 | _cBK | ||
| 999 |
_c1424 _d1424 |
||