Rotary percussive rock drill having counter rotation means,申请号US19620215114-传众专利搜索

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发明名称	Rotary percussive rock drill having counter rotation means
摘要
申请公布号	US3166131(A)	申请公布日期	1965.01.19
申请号	US19620215114	申请日期	1962.08.06
申请人	INGERSOLL-RAND COMPANY	发明人	WORMAN MARTIN
分类号	E21B6/00	主分类号	E21B6/00
代理机构		代理人
主权项
地址

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