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发明名称
Telephone system
摘要
申请公布号
US1901944(A)
申请公布日期
1933.03.21
申请号
US19320610326
申请日期
1932.05.10
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ALLEN LAWRENCE H.
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
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