Rotary drilling machine,申请号US19400336937-传众专利搜索

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发明名称	Rotary drilling machine
摘要
申请公布号	US2223779(A)	申请公布日期	1940.12.03
申请号	US19400336937	申请日期	1940.05.24
申请人	THE INTERNATIONAL DERRICK & EQUIPMENT COMPANY	发明人	BLOSS RICHARD R.
分类号	E21B3/04	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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