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发明名称
Signaling system
摘要
申请公布号
US1862578(A)
申请公布日期
1932.06.14
申请号
US19280317584
申请日期
1928.11.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MURPHY PAUL B.
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
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地址
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