EXPANDIBLE DRILLING HEAD,申请号AU19800062424-传众专利搜索

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发明名称	EXPANDIBLE DRILLING HEAD
摘要
申请公布号	AU6242480(A)	申请公布日期	1981.03.19
申请号	AU19800062424	申请日期	1979.09.14
申请人	PIPELINE BORING PTY. LTD.	发明人	J.E. KNELL
分类号	E21B10/32	主分类号	E21B10/32
代理机构		代理人
主权项
地址

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