DOWN-THE-HOLE DRILL,申请号ZA19870000554-传众专利搜索

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发明名称	DOWN-THE-HOLE DRILL
摘要
申请公布号	ZA8700554(B)	申请公布日期	1987.09.30
申请号	ZA19870000554	申请日期	1987.01.26
申请人	BOART INTERNATIONAL LIMITED	发明人	DAVID WILLIAM PAUL;DAVID STANLEY WILLIAMS
分类号	E21B	主分类号	E21B
代理机构		代理人
主权项
地址

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