Improvements in or relating to drill bits,申请号GB19490032329-传众专利搜索

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发明名称	Improvements in or relating to drill bits
摘要
申请公布号	GB680771(A)	申请公布日期	1952.10.08
申请号	GB19490032329	申请日期	1949.12.16
申请人	STANDARD OIL DEVELOPMENT COMPANY	发明人
分类号	E21B12/02	主分类号	E21B12/02
代理机构		代理人
主权项
地址

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