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发明名称
BRANCH CONNECTION SYSTEM BETWEEN TELEPHONE SET AND SPEAKER FOR WIRED BROADCAST TELEPHONE CALL
摘要
申请公布号
JPH03104374(A)
申请公布日期
1991.05.01
申请号
JP19890242903
申请日期
1989.09.18
申请人
NEC CORP
发明人
YONEZAWA TETSUO
分类号
H04H20/76;H04H20/81;H04M3/42;H04M13/00
主分类号
H04H20/76
代理机构
代理人
主权项
地址
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