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发明名称
Couronne de sondage
摘要
申请公布号
CH387573(A)
申请公布日期
1965.02.15
申请号
CH19620013537
申请日期
1962.11.19
申请人
DIAMANT BOART
发明人
RENARD,JAN
分类号
E21B10/48
主分类号
E21B10/48
代理机构
代理人
主权项
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