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经营范围
发明名称
Apparatus and process for cementing wells
摘要
申请公布号
US1910442(A)
申请公布日期
1933.05.23
申请号
US19300499989
申请日期
1930.12.04
申请人
THE R. S. M. COMPANY, INC.
发明人
MANNING SANFORD E.
分类号
E21B33/14
主分类号
E21B33/14
代理机构
代理人
主权项
地址
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