Earth bit driver,申请号US19580780550-传众专利搜索

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发明名称	Earth bit driver
摘要
申请公布号	US3000453(A)	申请公布日期	1961.09.19
申请号	US19580780550	申请日期	1958.12.15
申请人	ST GERMAIN WILLIAM A	发明人	GERMAIN WILLIAM A. ST.
分类号	E21B7/04	主分类号	E21B7/04
代理机构		代理人
主权项
地址

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