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发明名称
Duplex loud speaker sound box system
摘要
申请公布号
US3136383(A)
申请公布日期
1964.06.09
申请号
US19630265485
申请日期
1963.03.15
申请人
HOPKINS HERBERT J
发明人
HOPKINS HERBERT J.
分类号
H04R1/22
主分类号
H04R1/22
代理机构
代理人
主权项
地址
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