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发明名称
Signaling system
摘要
申请公布号
US2195857(A)
申请公布日期
1940.04.02
申请号
US19370180970
申请日期
1937.12.21
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
FITCH CLYDE J.
分类号
H04L13/14
主分类号
H04L13/14
代理机构
代理人
主权项
地址
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