Improvements in swivels for rotary well-boring apparatus,申请号GB19310007652-传众专利搜索

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发明名称	Improvements in swivels for rotary well-boring apparatus
摘要
申请公布号	GB380487(A)	申请公布日期	1932.09.12
申请号	GB19310007652	申请日期	1931.03.12
申请人	THE NATIONAL SUPPLY CORPORATION	发明人
分类号	E21B21/02	主分类号	E21B21/02
代理机构		代理人
主权项
地址

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