CHIP RELIEF FOR ROCK BITS,申请号ZA19850003170-传众专利搜索

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发明名称	CHIP RELIEF FOR ROCK BITS
摘要
申请公布号	ZA8503170(B)	申请公布日期	1985.12.24
申请号	ZA19850003170	申请日期	1985.04.29
申请人	SMITH INTERNATIONAL, INC.	发明人	JOHN RANDALL COATES
分类号	E21B;E21C	主分类号	E21B
代理机构		代理人
主权项
地址

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