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经营范围
发明名称
Oilbath rotary
摘要
申请公布号
US2009176(A)
申请公布日期
1935.07.23
申请号
US19310523756
申请日期
1931.03.19
申请人
OIL WELL SUPPLY COMPANY
发明人
GREVE EDGAR E.
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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