Air balanced oil well equipment,申请号US19580716755-传众专利搜索

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发明名称	Air balanced oil well equipment
摘要
申请公布号	US3011774(A)	申请公布日期	1961.12.05
申请号	US19580716755	申请日期	1958.02.21
申请人	O'LEARY CHARLES M	发明人	O'LEARY CHARLES M.
分类号	F04B47/14	主分类号	F04B47/14
代理机构		代理人
主权项
地址

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