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发明名称
Telephone system
摘要
申请公布号
US1804778(A)
申请公布日期
1931.05.12
申请号
US19290392114
申请日期
1929.09.12
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
JOHNSON LEWIS H.;STOKELY RAY L.
分类号
H04Q3/00
主分类号
H04Q3/00
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代理人
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