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发明名称
Target-angle trainer
摘要
申请公布号
US2523345(A)
申请公布日期
1950.09.26
申请号
US19460696967
申请日期
1946.09.13
申请人
WATSON GEORGE E
发明人
WATSON GEORGE E.
分类号
G09B9/00
主分类号
G09B9/00
代理机构
代理人
主权项
地址
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