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发明名称
Drag-head for dredging machines
摘要
申请公布号
US1939389(A)
申请公布日期
1933.12.12
申请号
US19320649723
申请日期
1932.12.31
申请人
CONDRON MARK M
发明人
CONDRON MARK M.
分类号
E02F3/92
主分类号
E02F3/92
代理机构
代理人
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