Improvements in or relating to drill assemblies,申请号GB19550006305-传众专利搜索

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发明名称	Improvements in or relating to drill assemblies
摘要
申请公布号	GB765907(A)	申请公布日期	1957.01.16
申请号	GB19550006305	申请日期	1955.03.03
申请人	THOMPSON PRODUCTS LIMITED	发明人
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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