Drill bits,申请号US19590796708-传众专利搜索

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发明名称	Drill bits
摘要
申请公布号	US3066750(A)	申请公布日期	1962.12.04
申请号	US19590796708	申请日期	1959.03.02
申请人	JERSEY PRODUCTION RESEARCH COMPANY	发明人	HILDEBRANDT ALEXANDER B.
分类号	E21B10/54;E21B10/60	主分类号	E21B10/54
代理机构		代理人
主权项
地址

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