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发明名称
Acoustical device
摘要
申请公布号
US1769438(A)
申请公布日期
1930.07.01
申请号
US19290370814
申请日期
1929.06.14
申请人
JACOB KULLMAN
发明人
KULLMAN JACOB
分类号
H04R1/28;H04R7/12
主分类号
H04R1/28
代理机构
代理人
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地址
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