Improved method of and apparatus for drilling interpenetrating parallel holes,申请号GB19590033500-传众专利搜索

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发明名称	Improved method of and apparatus for drilling interpenetrating parallel holes
摘要
申请公布号	GB865935(A)	申请公布日期	1961.04.26
申请号	GB19590033500	申请日期	1959.10.02
申请人	SANDVIKENS JERNVERKS AKTIEBOLAG	发明人
分类号	E21B19/24	主分类号	E21B19/24
代理机构		代理人
主权项
地址

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