Improvements in or relating to rotary drilling tools,申请号GB19480004294-传众专利搜索

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发明名称	Improvements in or relating to rotary drilling tools
摘要
申请公布号	GB646850(A)	申请公布日期	1950.11.29
申请号	GB19480004294	申请日期	1948.02.13
申请人	LEON NUSSBAUM	发明人
分类号	E21B10/48	主分类号	E21B10/48
代理机构		代理人
主权项
地址

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