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发明名称
Directional microphone system
摘要
申请公布号
US2810786(A)
申请公布日期
1957.10.22
申请号
US19510230104
申请日期
1951.06.06
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
SPANDOCK FRIEDRICH;GILLITZER ERWIN
分类号
H04R1/40
主分类号
H04R1/40
代理机构
代理人
主权项
地址
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