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发明名称
Double reentrant cone loud speaker
摘要
申请公布号
US1809597(A)
申请公布日期
1931.06.09
申请号
US19270175989
申请日期
1927.03.17
申请人
FEDERAL TELEGRAPH COMPANY
发明人
NICOLSON ALEXANDER MCLEAN
分类号
H04R1/24
主分类号
H04R1/24
代理机构
代理人
主权项
地址
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