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1Denshin denwa nenkan電信電話年鑑Tōkyō : Nihon Denshin Denwa Kōsha.v. : ill.
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2Denshin denwa keiei geppō電信電話経営月報 /Tōkyō : Denki Tsūshin Kyōkai.v. : ill.
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3Denki tsūshin keiei電気通信経営 /Published 1982### CRL customization ### ?> ### Add publisher and desc details ### ?>Tōkyō : Nihon Denshin Denwa Kōsha : Denki Tsūshin Kyōkai, Shōwa 57- [1982-