METHOD OF SAFEGUARDING BREACHES IN THE ROOF OF A HEADING UNDER EXPLOITATION,申请号PL19780207959-传众专利搜索

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发明名称	METHOD OF SAFEGUARDING BREACHES IN THE ROOF OF A HEADING UNDER EXPLOITATION
摘要
申请公布号	PL112169(B2)	申请公布日期	1980.09.30
申请号	PL19780207959	申请日期	1978.06.26
申请人		发明人
分类号	E21D;E21D17/04;E21D20/00;(IPC1-7):E21D20/00	主分类号	E21D
代理机构		代理人
主权项
地址

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