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发明名称
Gulley emptying apparatus incorporating a vacuum chamber
摘要
申请公布号
US2525372(A)
申请公布日期
1950.10.10
申请号
US19480010515
申请日期
1948.02.24
申请人
RIDDELL LEONARD H
发明人
RIDDELL LEONARD H.
分类号
E03F7/10
主分类号
E03F7/10
代理机构
代理人
主权项
地址
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