Well drilling system,申请号US19550548048-传众专利搜索

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发明名称	Well drilling system
摘要
申请公布号	US2937007(A)	申请公布日期	1960.05.17
申请号	US19550548048	申请日期	1955.11.21
申请人	FRANK WHITTLE	发明人	WHITTLE FRANK
分类号	E21B4/02;E21B17/07;E21B44/00	主分类号	E21B4/02
代理机构		代理人
主权项
地址

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