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发明名称
Telephone system
摘要
申请公布号
US2294907(A)
申请公布日期
1942.09.08
申请号
US19410374822
申请日期
1941.01.17
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HOVLAND HENRY
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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