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发明名称
Demonstrator for the formula for the surface of a sphere
摘要
申请公布号
US2872743(A)
申请公布日期
1959.02.10
申请号
US19570644700
申请日期
1957.03.07
申请人
FELDHAKE HERBERT J
发明人
FELDHAKE HERBERT J.
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
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