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发明名称
Right triangle solving device
摘要
申请公布号
US2481549(A)
申请公布日期
1949.09.13
申请号
US19460685885
申请日期
1946.07.24
申请人
WARD CHARLES W
发明人
WARD CHARLES W.
分类号
G06G3/06
主分类号
G06G3/06
代理机构
代理人
主权项
地址
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