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发明名称
Telephone system
摘要
申请公布号
US1868956(A)
申请公布日期
1932.07.26
申请号
US19310512047
申请日期
1931.01.29
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
THARP VICTOR S.
分类号
H04M3/62
主分类号
H04M3/62
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代理人
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