Improvements in rock drilling tools,申请号GB19500005496-传众专利搜索

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发明名称	Improvements in rock drilling tools
摘要
申请公布号	GB668789(A)	申请公布日期	1952.03.19
申请号	GB19500005496	申请日期	1950.03.03
申请人	INGERSOLL-RAND COMPANY;BENJAMIN FRANKLIN SHEPHERD	发明人
分类号	E21B10/58	主分类号	E21B10/58
代理机构		代理人
主权项
地址

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