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发明名称
Acoustic device
摘要
申请公布号
US2002189(A)
申请公布日期
1935.05.21
申请号
US19280270683
申请日期
1928.04.17
申请人
RADIO CORPORATION OF AMERICA
发明人
ROUND HENRY JOSEPH;RUST NOEL MEYER
分类号
H04R7/16;H04R9/04
主分类号
H04R7/16
代理机构
代理人
主权项
地址
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