Well reaming tool,申请号US19370149661-传众专利搜索

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发明名称	Well reaming tool
摘要
申请公布号	US2170451(A)	申请公布日期	1939.08.22
申请号	US19370149661	申请日期	1937.06.22
申请人	JOHN GRANT	发明人	GRANT JOHN
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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