Boorkolom, alsmede zwaarstang en boorbuis hiervoor,申请号NL19870020473-传众专利搜索

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发明名称	Boorkolom, alsmede zwaarstang en boorbuis hiervoor
摘要
申请公布号	NL192346(B)	申请公布日期	1997.02.03
申请号	NL19870020473	申请日期	1987.09.02
申请人	ROY LELAND DUDMAN	发明人
分类号	E21B17/00;E21B17/042;E21B17/16;(IPC1-7):E21B17/042	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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