Core removing plunger,申请号US19340730212-传众专利搜索

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发明名称	Core removing plunger
摘要
申请公布号	US2054254(A)	申请公布日期	1936.09.15
申请号	US19340730212	申请日期	1934.06.12
申请人	GLOBE OIL TOOLS COMPANY	发明人	HOWARD JOHN H.
分类号	E21B25/00	主分类号	E21B25/00
代理机构		代理人
主权项
地址

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