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经营范围
发明名称
CONFERENCE SWITCHING SYSTEM
摘要
申请公布号
US3544726(A)
申请公布日期
1970.12.01
申请号
USD3544726
申请日期
1968.02.26
申请人
AMERICAN TELEPHONE & TELEGRAPH CO.
发明人
BERRY J. WIMBERLY
分类号
H04M3/56;(IPC1-7):H04M3/42
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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