00879nam a2200277 c 4500001001300000005001500013007000300028008004100031049001400072052001700086056001400103082001400117245009700131260004300228300003000271490002600301500004300327504002400370650004700394650004700441700001900488700001400507700001400521830004900535950001700584KMO20217197020220121095029ta210906s1992    ulkd          000   kor  0 lEM811270801a326.44b21-1  a326.442601a384.622300a公衆電話事業의 事業性 提高에 관한 硏究 /d朴永喆,e金亮列,e高榮珍  a서울 :b통신개발연구원,c1992  a211 p. :b도표 ;c24 cm10a硏究報告 ;v90-06  a권말부록: 거시경제지표-1 등  a참고문헌 수록 8a공중 전화[公衆電話]0KSH1998005078 8a전화 사업[電話事業]0KSH20000222771 a박영철4aut1 a김양열1 a고영진 0a연구보고(통신개발연구원) ;v90-061 a가격불명