Improvements in or relating to a drill bit assembly,申请号GB19500012308-传众专利搜索

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发明名称	Improvements in or relating to a drill bit assembly
摘要
申请公布号	GB674462(A)	申请公布日期	1952.06.25
申请号	GB19500012308	申请日期	1950.05.17
申请人	PATRICK ADAMSON	发明人
分类号	E21B4/16;E21B10/50	主分类号	E21B4/16
代理机构		代理人
主权项
地址

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