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发明名称
Electro-acoustic devices
摘要
申请公布号
US2971597(A)
申请公布日期
1961.02.14
申请号
US19410409712
申请日期
1941.09.05
申请人
HENRY HEINRICH & CO.
发明人
GORIKE RUDOLF
分类号
H04R1/22
主分类号
H04R1/22
代理机构
代理人
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