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发明名称
Telephone system
摘要
申请公布号
US2294500(A)
申请公布日期
1942.09.01
申请号
US19400361365
申请日期
1940.10.16
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HOVLAND HENRY
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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