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发明名称
TELEPHONE CONFERENCE CIRCUIT
摘要
申请公布号
US3423538(A)
申请公布日期
1969.01.21
申请号
USD3423538
申请日期
1964.12.28
申请人
BELL TELEPHONE LAB. INC.
发明人
WILMER B. GAUNT JR.
分类号
H04M3/56;(IPC1-7):H04M3/56
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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