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发明名称
Loud speaker system
摘要
申请公布号
US2632055(A)
申请公布日期
1953.03.17
申请号
US19490088152
申请日期
1949.04.18
申请人
PARKER JOHN E
发明人
PARKER JOHN E.
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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