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发明名称
Ring gate structure
摘要
申请公布号
US2200667(A)
申请公布日期
1940.05.14
申请号
US19370141780
申请日期
1937.05.10
申请人
CANNELL PAUL J
发明人
CANNELL PAUL J.
分类号
E02B8/04
主分类号
E02B8/04
代理机构
代理人
主权项
地址
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