Casing-head packing and oil saver,申请号US19270204099-传众专利搜索

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发明名称	Casing-head packing and oil saver
摘要
申请公布号	US1772210(A)	申请公布日期	1930.08.05
申请号	US19270204099	申请日期	1927.07.07
申请人	DALE CHARLEY E	发明人	DALE CHARLEY E.
分类号	E21B33/08	主分类号	E21B33/08
代理机构		代理人
主权项
地址

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