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发明名称
ELECTROACOUSTIC TRANSDUCERS
摘要
申请公布号
CA491765(A)
申请公布日期
1953.03.31
申请号
CAD491765
申请日期
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
RALPH R. KREISEL
分类号
主分类号
代理机构
代理人
主权项
地址
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