Well drilling rigs,申请号US19550554748-传众专利搜索

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发明名称	Well drilling rigs
摘要
申请公布号	US2815929(A)	申请公布日期	1957.12.10
申请号	US19550554748	申请日期	1955.12.22
申请人	ANTONIO ANDREATTA	发明人	ANDREATTA ANTONIO
分类号	E21B7/02	主分类号	E21B7/02
代理机构		代理人
主权项
地址

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