Core barrel assembly,申请号US19500192748-传众专利搜索

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发明名称	Core barrel assembly
摘要
申请公布号	US2668037(A)	申请公布日期	1954.02.02
申请号	US19500192748	申请日期	1950.10.28
申请人	REED ROLLER BIT COMPANY	发明人	STOKES JOHN C.
分类号	E21B25/12	主分类号	E21B25/12
代理机构		代理人
主权项
地址

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