| 000 | 00309nam a22000977a 4500 | ||
|---|---|---|---|
| 082 | _a621.381 USE'O | ||
| 245 | _aTHE USE OF ELECTRONIC VALVES PART-3 PHOTOCELLS TRANSMISSION HIH VALVES AND COLD CATHODE GAS FIELDS VALVES | ||
| 260 |
_aLONDON _bBRITISH STANDARD INTERNATIONAL _c1956 |
||
| 300 | _a15P | ||
| 942 | _cBK | ||
| 999 |
_c582963 _d582963 |
||