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发明名称
Communication system
摘要
申请公布号
US2220889(A)
申请公布日期
1940.11.12
申请号
US19390296248
申请日期
1939.09.23
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
COLE IRA E.
分类号
H04M11/06
主分类号
H04M11/06
代理机构
代理人
主权项
地址
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