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经营范围
发明名称
Ferroelectric transducer
摘要
申请公布号
US2872600(A)
申请公布日期
1959.02.03
申请号
US19530348646
申请日期
1953.04.14
申请人
SPRAGUE ELECTRIC COMPANY
发明人
PECK DAVID B.
分类号
H04R17/00
主分类号
H04R17/00
代理机构
代理人
主权项
地址
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