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发明名称
Piezoelectric device
摘要
申请公布号
US2414489(A)
申请公布日期
1947.01.21
申请号
US19420432020
申请日期
1942.02.23
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
SHOMER JOHN E.
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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