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发明名称
Piezoelectric device
摘要
申请公布号
US2244690(A)
申请公布日期
1941.06.10
申请号
US19390294237
申请日期
1939.09.11
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
GRAVLEY CHARLES K.;NEFF JOSEPH J.
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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