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摘要
申请公布号
US2204641(A)
申请公布日期
1940.06.18
申请号
US19370162203
申请日期
1937.09.02
申请人
WRIGHT MILO P
发明人
WRIGHT MILO P.
分类号
G09B15/02
主分类号
G09B15/02
代理机构
代理人
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