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发明名称
Selective signaling system
摘要
申请公布号
US2442702(A)
申请公布日期
1948.06.01
申请号
US19450617633
申请日期
1945.09.20
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MARRISON WARREN A.
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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