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发明名称
Scraper dump control
摘要
申请公布号
US2389199(A)
申请公布日期
1945.11.20
申请号
US19440549167
申请日期
1944.08.12
申请人
LAIRD ROYAL B
发明人
LAIRD ROYAL B.
分类号
E02F3/64
主分类号
E02F3/64
代理机构
代理人
主权项
地址
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