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发明名称
COMMUNICATION SYSTEM FOR CLASSROOM USE AND THE LIKE
摘要
申请公布号
US3462688(A)
申请公布日期
1969.08.19
申请号
USD3462688
申请日期
1967.04.10
申请人
WILLIAM E. ABEL
发明人
WILLIAM E. ABEL
分类号
G09B5/12;H03D3/04;H03G11/00;H04B1/38;H04B5/00;H04J1/20;(IPC1-7):H04B1/04;H04B1/16
主分类号
G09B5/12
代理机构
代理人
主权项
地址
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