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082 | _a621.342/ALD | ||
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245 | _aTHERMIONIC VACUUM TUBES | ||
250 | _a7TH | ||
260 |
_bMETHUN & CO LTD _aLONDON _c1958 |
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300 | _c161P | ||
650 | _aAPPLIED PHYSICS | ||
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_c66494 _d66494 |