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发明名称
Piezoelectric crystal apparatus
摘要
申请公布号
GB540184(A)
申请公布日期
1941.10.08
申请号
GB19400009972
申请日期
1940.06.07
申请人
发明人
分类号
H03H9/02;H03H9/09;H03H9/13;H03H9/19;H03H9/56
主分类号
H03H9/02
代理机构
代理人
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