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发明名称
Electrical signalling apparatus
摘要
申请公布号
US2904624(A)
申请公布日期
1959.09.15
申请号
US19550513927
申请日期
1955.06.08
申请人
NEISWINTER JAMES T
发明人
NEISWINTER JAMES T.
分类号
H04L25/49
主分类号
H04L25/49
代理机构
代理人
主权项
地址
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