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发明名称
Head gate control device
摘要
申请公布号
US2170200(A)
申请公布日期
1939.08.22
申请号
US19380228468
申请日期
1938.09.06
申请人
KARNES DAVID W
发明人
KARNES DAVID W.
分类号
E02B7/20
主分类号
E02B7/20
代理机构
代理人
主权项
地址
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