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发明名称
Telephone system
摘要
申请公布号
US1938709(A)
申请公布日期
1933.12.12
申请号
US19330663781
申请日期
1933.03.31
申请人
BELL TELEPHONE LABERATORIES, INCORPORATED
发明人
MASSONNEAU ROBERT F.
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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地址
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