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发明名称
DIRECTIONAL ELECTRET TRANSDUCER
摘要
申请公布号
CA822821(A)
申请公布日期
1969.09.09
申请号
CAD822821
申请日期
申请人
NORTHERN ELECTRIC COMPANY LIMITED
发明人
CORNELIS W. REEDYK
分类号
主分类号
代理机构
代理人
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