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发明名称
Acoustical devices
摘要
申请公布号
US3032138(A)
申请公布日期
1962.05.01
申请号
US19570698468
申请日期
1957.11.25
申请人
HAWLEY PRODUCTS COMPANY
发明人
JR. WILLIAM W. HAERTHER,
分类号
H04R7/14;H04R7/20
主分类号
H04R7/14
代理机构
代理人
主权项
地址
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