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发明名称
Extension loud speaker
摘要
申请公布号
US2896737(A)
申请公布日期
1959.07.28
申请号
US19580756807
申请日期
1958.08.25
申请人
ORBIT INDUSTRIES, INC.
发明人
GELLMAN GERALD
分类号
H04R1/28
主分类号
H04R1/28
代理机构
代理人
主权项
地址
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