YIELDABLE LINING FOR CORRIDOR-TYPE EXCAVATIONS ESPECIALLY THOSE IN BEDS SHOWING CRUMPING TENDENCIES,申请号PL19780210085-传众专利搜索

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发明名称	YIELDABLE LINING FOR CORRIDOR-TYPE EXCAVATIONS ESPECIALLY THOSE IN BEDS SHOWING CRUMPING TENDENCIES
摘要
申请公布号	PL111949(B4)	申请公布日期	1980.09.30
申请号	PL19780210085	申请日期	1978.10.05
申请人		发明人
分类号	E21D;E21D11/18;(IPC1-7):E21D11/18	主分类号	E21D
代理机构		代理人
主权项
地址

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