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发明名称
Loud speaker
摘要
申请公布号
US1974770(A)
申请公布日期
1934.09.25
申请号
US19330651549
申请日期
1933.01.13
申请人
THE ROLA COMPANY
发明人
ENGHOTM BERNARD A.
分类号
H04R9/04
主分类号
H04R9/04
代理机构
代理人
主权项
地址
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