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经营范围
发明名称
Signaling system
摘要
申请公布号
US2183941(A)
申请公布日期
1939.12.19
申请号
US19370125241
申请日期
1937.02.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
PRUDEN HAROLD M.
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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