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发明名称	YIELDING MINE PROP
摘要
申请公布号	ZA9001984(B)	申请公布日期	1990.12.28
申请号	ZA19900001984	申请日期	1990.03.15
申请人	ANGLO AMERICAN CORPORATION OF SOUTH AFRICA LTD.	发明人	ANTHONY JOHN SPENCER SPEARING
分类号	E21D	主分类号	E21D
代理机构		代理人
主权项
地址

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