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发明名称
School to home communication system
摘要
申请公布号
US2855461(A)
申请公布日期
1958.10.07
申请号
US19570644807
申请日期
1957.03.08
申请人
NATHANIEL A. KARR;PHILIP H. SEAMAN
发明人
BERNSTEIN ALLAN C.
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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