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发明名称
Two-way telephone system
摘要
申请公布号
US2332430(A)
申请公布日期
1943.10.19
申请号
US19420451112
申请日期
1942.07.16
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BERGER URIAH S.
分类号
H04M1/60
主分类号
H04M1/60
代理机构
代理人
主权项
地址
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