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经营范围
发明名称
SLIDING UNIT FOR WELLS
摘要
申请公布号
JPS5659934(A)
申请公布日期
1981.05.23
申请号
JP19800139244
申请日期
1980.10.03
申请人
VARCO INT
发明人
KRASNOV IGOR
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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