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发明名称
Two-way signaling system
摘要
申请公布号
US1881801(A)
申请公布日期
1932.10.11
申请号
US19290411423
申请日期
1929.12.04
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MATHES ROBERT C.
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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