00825nam a2200253 c 4500001001300000005001500013007000300028008004100031049001400072052001800086056001500104082001500119245008800134260004300222300002900265490002600294504002400320650004700344650004700391700005300438700001400491830004900505950001700554KMO20217239720220203155030ta210906s1991    ulkd          000   kor  0 lEM811263801a326.441b21-2  a326.4412601a384.6322300a公衆電話事業 長期開發計劃 樹立方案 /d著者: 崔炳鎰,e姜愛隣  a서울 :b通信開發硏究院,c1991  a74 p. :b도표 ;c24 cm10a硏究報告 ;v91-46  a참고문헌 수록 8a공중 전화[公衆電話]0KSH1998005078 8a전화 통신[電話通信]0KSH20000236571 a최병일,g崔炳鎰,d1958-0KAC2012225154aut1 a강애린 0a연구보고(통신개발연구원) ;v91-461 a가격불명