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发明名称
Classroom communicator
摘要
申请公布号
US2738595(A)
申请公布日期
1956.03.20
申请号
US19520280794
申请日期
1952.04.05
申请人
RESEARCH CORPORATION
发明人
JOHN FRANK T.;JR. JOHN B. CANNON,
分类号
G09B5/00
主分类号
G09B5/00
代理机构
代理人
主权项
地址
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