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发明名称
Communication system
摘要
申请公布号
US2257568(A)
申请公布日期
1941.09.30
申请号
US19390279015
申请日期
1939.06.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MATHES ROBERT C.
分类号
H04M1/50;H04Q3/00
主分类号
H04M1/50
代理机构
代理人
主权项
地址
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