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发明名称
Acoustic device
摘要
申请公布号
US1918164(A)
申请公布日期
1933.07.11
申请号
US19290391652
申请日期
1929.09.10
申请人
WOOLF WILLIAM L;CORNWELL LIONEL B
发明人
WOOLF WILLIAM L.;CORNWELL LIONEL B.
分类号
H04R1/30;H04R7/12
主分类号
H04R1/30
代理机构
代理人
主权项
地址
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