Oil well drilling,申请号US19300426616-传众专利搜索

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发明名称	Oil well drilling
摘要
申请公布号	US1847864(A)	申请公布日期	1932.03.01
申请号	US19300426616	申请日期	1930.02.07
申请人	SILICA PRODUCTS CO.	发明人	CROSS ROY
分类号	E21B21/06	主分类号	E21B21/06
代理机构		代理人
主权项
地址

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