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发明名称
WELL DRILLING MUD AND PROCESS
摘要
申请公布号
CA455017(A)
申请公布日期
1949.03.08
申请号
CAD455017
申请日期
申请人
HALL LABORATORIES
发明人
GERALD B. TJOFLAT
分类号
主分类号
代理机构
代理人
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