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发明名称
CALL SIGNAL DETECTING DEVICE
摘要
申请公布号
GB2157918(B)
申请公布日期
1987.12.02
申请号
GB19850008528
申请日期
1985.04.02
申请人
* RICOH COMPANY LTD
发明人
MASAO * KIGUCHI
分类号
H04M1/82;H04N1/327;H04Q1/44;(IPC1-7):H04Q1/44
主分类号
H04M1/82
代理机构
代理人
主权项
地址
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