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发明名称
Reverting call telephone system
摘要
申请公布号
US2896023(A)
申请公布日期
1959.07.21
申请号
US19530374037
申请日期
1953.08.13
申请人
GENERAL TELEPHONE LABORATORIES, INCORPORATED
发明人
BAKKER PIER
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
主权项
地址
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