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发明名称
Piezo-electric crystal apparatus
摘要
申请公布号
GB479979(A)
申请公布日期
1938.02.15
申请号
GB19370004301
申请日期
1937.02.12
申请人
发明人
分类号
H03H9/00;H03H9/02;H03H9/05;H03H9/13;H03H9/17;H03H9/19;H03H9/215;H03H9/54;H03H9/56
主分类号
H03H9/00
代理机构
代理人
主权项
地址
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