Rock drill bit,申请号US19610150769-传众专利搜索

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发明名称	Rock drill bit
摘要
申请公布号	US3149686(A)	申请公布日期	1964.09.22
申请号	US19610150769	申请日期	1961.11.07
申请人	HART WALTER A	发明人	HART WALTER A.
分类号	E21B10/36	主分类号	E21B10/36
代理机构		代理人
主权项
地址

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