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发明名称
SOUND TRANSDUCING DEVICES
摘要
申请公布号
CA697630(A)
申请公布日期
1964.11.10
申请号
CAD697630
申请日期
申请人
ZENITH RADIO CORPORATION
发明人
RAYMOND T. CHRISTENSEN
分类号
主分类号
代理机构
代理人
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