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发明名称
EXCAVATING AND TIGHTENING APPARATUS
摘要
申请公布号
JPS52115702(A)
申请公布日期
1977.09.28
申请号
JP19770000007
申请日期
1977.01.04
申请人
SECOMA
发明人
PERRAUD RAYMOND JEAN
分类号
E21B7/02;E21B15/00;E21B19/08;E21B19/084;E21D20/00;E21D21/00
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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