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发明名称
ELECTROMAGNETIC SOUND REPRODUCER
摘要
申请公布号
CA310910(A)
申请公布日期
1931.04.28
申请号
CAD310910
申请日期
申请人
THE UNITED REPRODUCERS CORPORATION
发明人
IGAR S. BOBROVSKY
分类号
主分类号
代理机构
代理人
主权项
地址
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