Portable drilling rig assembly,申请号US19540414693-传众专利搜索

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发明名称	Portable drilling rig assembly
摘要
申请公布号	US2807441(A)	申请公布日期	1957.09.24
申请号	US19540414693	申请日期	1954.03.08
申请人	SEWELL BEN W	发明人	SEWELL BEN W.
分类号	B23B47/10;E21B7/02;E21B15/00	主分类号	B23B47/10
代理机构		代理人
主权项
地址

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