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发明名称
摘要
申请公布号	FR2452574(B1)	申请公布日期	1983.11.04
申请号	FR19800007126	申请日期	1980.03.26
申请人	SCHMIDT PAUL	发明人
分类号	E21B7/26;E21B4/14;(IPC1-7):E21B7/26;B25D9/14;E02F5/16;E02F5/18	主分类号	E21B7/26
代理机构		代理人
主权项
地址

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