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发明名称
Apparatus for determining the wall building properties of well drilling fluids
摘要
申请公布号
US2443781(A)
申请公布日期
1948.06.22
申请号
US19430473364
申请日期
1943.01.23
申请人
ZACHER VERNON B
发明人
ZACHER VERNON B.
分类号
E21B21/06
主分类号
E21B21/06
代理机构
代理人
主权项
地址
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