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发明名称
LOUDSPEAKING TELEPHONE STATION INCLUDING DIRECTIONAL MICROPHONE
摘要
申请公布号
CA2027138(A1)
申请公布日期
1991.06.23
申请号
CA19902027138
申请日期
1990.10.09
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BAUMHAUER, JOHN C.;MCATEER, JEFFREY P.;WITTMAN, BRIAN A.
分类号
H04R3/02;H04M1/20;H04M1/60;H04M1/62;H04M9/08;H04R1/34;H04R1/38;H04R1/40;H04R27/00;(IPC1-7):H04M3/56
主分类号
H04R3/02
代理机构
代理人
主权项
地址
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