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发明名称
TELEPHONE CONFERENCE CIRCUIT
摘要
申请公布号
US3420959(A)
申请公布日期
1969.01.07
申请号
USD3420959
申请日期
1965.04.09
申请人
BELL TELEPHONE LAB. INC.
发明人
WILLIAM G. HALL
分类号
H04J3/20;H04M3/56;H04Q11/04;(IPC1-7):H04M3/56
主分类号
H04J3/20
代理机构
代理人
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地址
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