Drill bit with extensible blade,申请号US19600042166-传众专利搜索

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发明名称	Drill bit with extensible blade
摘要
申请公布号	US3145788(A)	申请公布日期	1964.08.25
申请号	US19600042166	申请日期	1960.07.11
申请人	JERSEY PRODUCTION RESEARCH COMPANY	发明人	KELLNER JACKSON M.
分类号	E21B10/62	主分类号	E21B10/62
代理机构		代理人
主权项
地址

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