IMPROVEMENTS RELATING TO VALVES,申请号GB19880002498-传众专利搜索

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发明名称	IMPROVEMENTS RELATING TO VALVES
摘要
申请公布号	GB8802498(D0)	申请公布日期	1988.03.02
申请号	GB19880002498	申请日期	1988.02.04
申请人	HY-RAM ENG CO LTD	发明人
分类号	E21B21/10;E21B34/10	主分类号	E21B21/10
代理机构		代理人
主权项
地址

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