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| 100 | _aEMRYS WILLIAMS, | ||
| 245 | _aTHERMIONIC VALVE CIRCUITS | ||
| 260 |
_bSIR ISAAC PITMAN AND SONS, LTD _aLONDON _c1961 |
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| 300 | _c426 P | ||
| 650 | _aAPPLIED PHYSICS | ||
| 650 | _aENGINEERING | ||
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