A DRILL STEM COLLAR ARRANGEMENT,申请号ZA19870002644-传众专利搜索

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发明名称	A DRILL STEM COLLAR ARRANGEMENT
摘要
申请公布号	ZA8702644(B)	申请公布日期	1987.11.25
申请号	ZA19870002644	申请日期	1987.04.13
申请人	DANIEL MINNAAR	发明人	DANIEL MINNAAR
分类号	B23B;E21B	主分类号	B23B
代理机构		代理人
主权项
地址

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