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发明名称
Electrical apparatus
摘要
申请公布号
US1865210(A)
申请公布日期
1932.06.28
申请号
US19280295336
申请日期
1928.07.25
申请人
COLUMBIA PHONOCRAPH COMPANY, INC.
发明人
PURSER WILLIAM SPENCER
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
地址
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