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发明名称
TELEPHONE CONFERENCE EQUIPMENT
摘要
申请公布号
JPH03289251(A)
申请公布日期
1991.12.19
申请号
JP19900088943
申请日期
1990.04.03
申请人
IWATSU ELECTRIC CO LTD;NIPPON TELEGR & TELEPH CORP <NTT>
发明人
WATANABE KAZUYUKI;TSURUGAI MASAYASU;MATSUZAKI HIDEAKI;MATSUI HIROYUKI;HOSOKAWA TOSHIO
分类号
H04M3/56
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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