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发明名称
Boring apparatus adapted for the removal of the material by automatic dredging devices
摘要
申请公布号
US1988414(A)
申请公布日期
1935.01.15
申请号
US19320609298
申请日期
1932.05.04
申请人
PIERRE BOGOUTSKY
发明人
BOGOUTSKY PIERRE
分类号
E21B7/00
主分类号
E21B7/00
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