Oil bath construction for rotaries,申请号US19290358416-传众专利搜索

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发明名称	Oil bath construction for rotaries
摘要
申请公布号	US1851799(A)	申请公布日期	1932.03.29
申请号	US19290358416	申请日期	1929.04.26
申请人	BLACK LEE J	发明人	BLACK LEE J.
分类号	E21B3/04	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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