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发明名称
TRIVELLA ATTIVATA E METODO DI TRIVELLAZIONE
摘要
申请公布号
IT8747854(D0)
申请公布日期
1987.04.15
申请号
IT19870047854
申请日期
1987.04.15
申请人
A JOHANNESBURG, SUD AFRICA GENERAL MINING UNION CORPORATION
发明人
BECHEM ULRICH WILHELM;BECHEM KLAUS;BECHEM PHILIP CARL
分类号
E21B10/08;E21B4/00;E21B4/10;E21B4/16;E21B10/12;(IPC1-7):E21B/
主分类号
E21B10/08
代理机构
代理人
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