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发明名称
Speaker construction
摘要
申请公布号
US2623254(A)
申请公布日期
1952.12.30
申请号
US19480050807
申请日期
1948.09.23
申请人
PROCTOR JOHN A
发明人
PROCTOR JOHN A.
分类号
H04R9/02
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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