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发明名称
Noise-Cancelling Handset
摘要
申请公布号
CA2090681(A1)
申请公布日期
1992.03.07
申请号
CA19912090681
申请日期
1991.09.05
申请人
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
发明人
HOLLIER, MICHAEL P.;WELSBY, KEVIN
分类号
H04M1/03;H04M1/19;H04R1/40;(IPC1-7):H04M1/19
主分类号
H04M1/03
代理机构
代理人
主权项
地址
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