Method and apparatus for impact drilling of overburden,申请号US19610118191-传众专利搜索

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发明名称	Method and apparatus for impact drilling of overburden
摘要
申请公布号	US3280925(A)	申请公布日期	1966.10.25
申请号	US19610118191	申请日期	1961.06.19
申请人	BECKER DRILLING (ALBERTA), LTD.	发明人	BECKER NORMAN D.;BECKER FLOYD WALTER
分类号	E21B21/12	主分类号	E21B21/12
代理机构		代理人
主权项
地址

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