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发明名称
Telephone system
摘要
申请公布号
US2136630(A)
申请公布日期
1938.11.15
申请号
US19350035909
申请日期
1935.08.13
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MASSONNEAU ROBERT F.
分类号
H04M1/31
主分类号
H04M1/31
代理机构
代理人
主权项
地址
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