BIT OF CIRCULAR CROSS SECTION,申请号GB19770014777-传众专利搜索

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发明名称	BIT OF CIRCULAR CROSS SECTION
摘要
申请公布号	GB1574972(A)	申请公布日期	1980.09.17
申请号	GB19770014777	申请日期	1977.04.07
申请人	VOEST AG	发明人
分类号	E21B10/00;E21C35/18;E21C35/183;(IPC1-7):E21C35/18	主分类号	E21B10/00
代理机构		代理人
主权项
地址

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