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发明名称
Piezoelectric crystal
摘要
申请公布号
US2490216(A)
申请公布日期
1949.12.06
申请号
US19470755167
申请日期
1947.06.17
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
JAFFE HANS
分类号
主分类号
代理机构
代理人
主权项
地址
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