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发明名称
CONFERENCE TELEPHONE SYSTEM
摘要
申请公布号
US3437758(A)
申请公布日期
1969.04.08
申请号
USD3437758
申请日期
1966.07.29
申请人
BELL TELEPHONE LAB. INC.
发明人
FRANK J. CLEMENT
分类号
H04M3/56;(IPC1-7):H04M3/08;H04B3/20
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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