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发明名称
Loud speaker
摘要
申请公布号
US1812213(A)
申请公布日期
1931.06.30
申请号
US19270179433
申请日期
1927.03.30
申请人
UNITED REPRODUCERS CORPORATION
发明人
MINTON JOHN P.
分类号
H04R1/28
主分类号
H04R1/28
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代理人
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