Improvements in couplings for drill rod sections and bits,申请号GB19520023504-传众专利搜索

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发明名称	Improvements in couplings for drill rod sections and bits
摘要
申请公布号	GB719848(A)	申请公布日期	1954.12.08
申请号	GB19520023504	申请日期	1952.09.18
申请人	SANDVIKENS JERNVERKS AKTIEBOLAG	发明人
分类号	E21B17/046	主分类号	E21B17/046
代理机构		代理人
主权项
地址

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