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发明名称
Improvements in piezoelectric crystal apparatus
摘要
申请公布号
GB625533(A)
申请公布日期
1949.06.29
申请号
GB19470021774
申请日期
1947.08.07
申请人
WESTERN ELECTRIC COMPANY
发明人
分类号
H03H3/04;H03H9/09
主分类号
H03H3/04
代理机构
代理人
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