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发明名称
Electromagnetic speaker
摘要
申请公布号
US2274513(A)
申请公布日期
1942.02.24
申请号
US19400361196
申请日期
1940.10.14
申请人
ALLEN WELLS ROY
发明人
WELLS ROY ALLEN
分类号
H04R11/02
主分类号
H04R11/02
代理机构
代理人
主权项
地址
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