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发明名称
Telephone system
摘要
申请公布号
US1914124(A)
申请公布日期
1933.06.13
申请号
US19320589582
申请日期
1932.01.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HARPER ROBERT W.
分类号
H04M1/22
主分类号
H04M1/22
代理机构
代理人
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地址
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