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发明名称
Hopper valve module for hopper dredge
摘要
申请公布号
USRE30358(E)
申请公布日期
1980.08.05
申请号
US19780963466
申请日期
1978.11.24
申请人
发明人
分类号
E02F7/04
主分类号
E02F7/04
代理机构
代理人
主权项
地址
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