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经营范围
发明名称
Demonstration apparatus
摘要
申请公布号
US2158906(A)
申请公布日期
1939.05.16
申请号
US19380244471
申请日期
1938.12.07
申请人
NETTER FRANK H
发明人
NETTER FRANK H.
分类号
G09B23/30
主分类号
G09B23/30
代理机构
代理人
主权项
地址
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