,申请号HU1974OA00537-传众专利搜索

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发明名称
摘要
申请公布号	HU170197(B)	申请公布日期	1977.04.28
申请号	HU1974OA00537	申请日期	1974.04.23
申请人		发明人
分类号	E21B17/00;(IPC1-7):E21B17/00	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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