01141nam a2200265 k 4500001001500000005001500015008004100030040001900071041001300090049003600103052002800139056001300167082001200180110004600192245020800238260004200446300003100488490005700519500002600576504002900602653011300631700005700744830005700801950001700858KMO199910417  20181115115124990519s1998    tjka          000   kor    a011001c0110010 akorbeng0 lEM1860574v45lEM1860575v45c201a559.6b한593ㅇㄱc45  a559.6240 a622221  a한국자원연구소,e편0KAB20180088610a長期開發 炭鑛의 原價節減 方案 및 機械化 硏究=x(A)study on measures to reduce production cost of the long-running collieries and coal mining mechanization/d한국자원연구소 [편]  a대전:b한국자원연구소,c1998  aviii,185p.:b삽도;c26cm10a硏究報告書= KIGAM research report;vKR-98(C)-45  a연구자 : 정소걸  a참고문헌 : p.184-185  a탄광a원가절감a기계화aMEASURESaREDUCEaPRODUCTIONaCOSTaCOLLIERIESaCOALaMININGaMECHANIZATION1 a정소걸,g鄭小杰,d1952-,e연구0KAC201620805 0a연구보고서(한국자원연구소);vKR-98(C)-451 a가격불명