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发明名称
Communication system
摘要
申请公布号
US2356519(A)
申请公布日期
1944.08.22
申请号
US19420461429
申请日期
1942.10.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HUBBARD FRANCIS A.
分类号
H04Q3/52;H04Q11/04
主分类号
H04Q3/52
代理机构
代理人
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地址
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