Denki tsūshin seido no minaoshi mondai
Subtitle: "NTT bunkatsu" rongi no dōkō
By: Yamaguchi Hirofumi
Series: Chōsa to jōhō -- dai 116-gō = -- Issue brief -- 116; Chōsa to jōhō -- dai 116-gō.
Publisher: Kokuritsu Kokkai Toshokan Chōsa oyobi Rippō Kōsakyoku
Published: 1989
Place of publication: Tōkyō
Language: jpn
Number of pages: 14