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发明名称
Duplex signaling system
摘要
申请公布号
US2283760(A)
申请公布日期
1942.05.19
申请号
US19400369691
申请日期
1940.12.12
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
PULLIS GEORGE A.
分类号
H04M1/74
主分类号
H04M1/74
代理机构
代理人
主权项
地址
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