SHIELD FOR PROTECTION OF ROOF AND LONGWALL FACE AREAS,申请号PL19870265432-传众专利搜索

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发明名称	SHIELD FOR PROTECTION OF ROOF AND LONGWALL FACE AREAS
摘要
申请公布号	PL154668(B1)	申请公布日期	1991.09.30
申请号	PL19870265432	申请日期	1987.04.28
申请人		发明人
分类号	E21D;E21D23/03;(IPC1-7):E21D23/03	主分类号	E21D
代理机构		代理人
主权项
地址

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