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210 0 _aJ. Radio Res. Lab.
222 0 _aJournal of the Radio Research Laboratories
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260 _aTokyo :
_bRadio research laboratories. Ministry of Posts and Telecommunications,
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300 _av.
650 0 4 _aRADIO
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710 1 _aRadio research laboratories.
_bMinistry of Posts and Telecommunications
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