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发明名称
DIRECTIONAL MICROPHONE
摘要
申请公布号
US3573400(A)
申请公布日期
1971.04.06
申请号
USD3573400
申请日期
1968.08.14
申请人
BELL TELEPHONE LABORATORIES INC.
发明人
GERHARD M. SESSLER;JAMES E. WEST
分类号
H04R1/38;(IPC1-7):H04R1/32
主分类号
H04R1/38
代理机构
代理人
主权项
地址
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