Improvements relating to hooks used in drilling oil and like wells,申请号GB19380025534-传众专利搜索

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发明名称	Improvements relating to hooks used in drilling oil and like wells
摘要
申请公布号	GB518639(A)	申请公布日期	1940.03.04
申请号	GB19380025534	申请日期	1938.08.31
申请人	BYRON JACKSON CO.	发明人
分类号	E21B19/04	主分类号	E21B19/04
代理机构		代理人
主权项
地址

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