,申请号BG19750031864-传众专利搜索

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法人/股东/高管

发明名称
摘要
申请公布号	BG22618(A1)	申请公布日期	1977.04.20
申请号	BG19750031864	申请日期	1975.12.22
申请人		发明人
分类号	E21C37/10;(IPC1-7):E21C37/10	主分类号	E21C37/10
代理机构		代理人
主权项
地址

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