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发明名称
Directional transducer
摘要
申请公布号
US2686847(A)
申请公布日期
1954.08.17
申请号
US19510261286
申请日期
1951.12.12
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
AAMODT THORALF
分类号
H04R19/04
主分类号
H04R19/04
代理机构
代理人
主权项
地址
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