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发明名称
Telephone system
摘要
申请公布号
US2306173(A)
申请公布日期
1942.12.22
申请号
US19400340072
申请日期
1940.06.12
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
LOGAN MASON A.
分类号
H04M15/08
主分类号
H04M15/08
代理机构
代理人
主权项
地址
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