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发明名称
Piezoelectric crystal elements
摘要
申请公布号
GB641470(A)
申请公布日期
1950.08.16
申请号
GB19460037772
申请日期
1946.12.23
申请人
发明人
分类号
H03H9/02;H03H9/17
主分类号
H03H9/02
代理机构
代理人
主权项
地址
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