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发明名称
Improvements in or relating to communication systems
摘要
申请公布号
GB476273(A)
申请公布日期
1937.12.06
申请号
GB19360032936
申请日期
1936.12.01
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
分类号
H04L25/42;H04L25/49
主分类号
H04L25/42
代理机构
代理人
主权项
地址
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