Method and means for drilling with changeable bits,申请号US19570650749-传众专利搜索

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发明名称	Method and means for drilling with changeable bits
摘要
申请公布号	US2954211(A)	申请公布日期	1960.09.27
申请号	US19570650749	申请日期	1957.04.04
申请人	PENROD RALPH U	发明人	PENROD RALPH U.
分类号	E21B10/04;E21B10/46	主分类号	E21B10/04
代理机构		代理人
主权项
地址

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