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21Kenkyū ihō硏究彙報Published 1948### CRL customization ### ?> ### Add publisher and desc details ### ?>[Sendai-shi?] : Denki Tsūshin Kenkyūjo, Shōwa 23 [1948]-v. : ill. ; 27 cm.
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22Tsūshinkyoku geppō通信局月報[Tōkyō] : Keizai Antei Honbu Tsūshinkyoku.v. ; 25 cm.
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23Kenkyū hōkoku硏究報告 /Published 1951### CRL customization ### ?> ### Add publisher and desc details ### ?>Tōkyō-to Musashino-shi : Denki Tsūshinshō denki Tsūshin Kenkyūjo, 1951.3 v. : ill. ; 26 cm.
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24Kenkyū shiryō硏究資料 /Published 1950### CRL customization ### ?> ### Add publisher and desc details ### ?>Tōkyō : Denki Tsūshinshō Denki Tsūshin Kenkyūjo, 1950-1951.18 v. : ill. ; 26 cm.