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发明名称
Telephone system
摘要
申请公布号
US2139247(A)
申请公布日期
1938.12.06
申请号
US19350026027
申请日期
1935.06.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
STOKELY RAY L.
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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