METHOD OF CUTTING AND EXPLOITING BED IN THE ZONES ESPECIALLY IMPERILLED BY CRUMP,申请号PL19770196891-传众专利搜索

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发明名称	METHOD OF CUTTING AND EXPLOITING BED IN THE ZONES ESPECIALLY IMPERILLED BY CRUMP
摘要
申请公布号	PL109110(B2)	申请公布日期	1980.05.31
申请号	PL19770196891	申请日期	1977.03.23
申请人		发明人
分类号	E21C;E21C41/00;(IPC1-7):E21C41/00	主分类号	E21C
代理机构		代理人
主权项
地址

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