Rock drilling bits,申请号US19530400947-传众专利搜索

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发明名称	Rock drilling bits
摘要
申请公布号	US2831661(A)	申请公布日期	1958.04.22
申请号	US19530400947	申请日期	1953.12.29
申请人	SECURITY ROCK BITS LIMITED	发明人	BROWN GEORGE RUSSELL
分类号	E21B10/18;E21B10/20	主分类号	E21B10/18
代理机构		代理人
主权项
地址

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