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发明名称
Telephone system
摘要
申请公布号
US1905662(A)
申请公布日期
1933.04.25
申请号
US19310577571
申请日期
1931.11.27
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ULRICH HORACE W.
分类号
H04M3/64
主分类号
H04M3/64
代理机构
代理人
主权项
地址
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