Foam pressure balanced walking beam type oil well pumping jack,申请号US19510246849-传众专利搜索

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发明名称	Foam pressure balanced walking beam type oil well pumping jack
摘要
申请公布号	US2664764(A)	申请公布日期	1954.01.05
申请号	US19510246849	申请日期	1951.09.15
申请人	BLACKBURN LUTHER A	发明人	BLACKBURN LUTHER A.
分类号	E21B1/02	主分类号	E21B1/02
代理机构		代理人
主权项
地址

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