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经营范围
发明名称
Piezoelectric crystal apparatus
摘要
申请公布号
US2460703(A)
申请公布日期
1949.02.01
申请号
US19460659679
申请日期
1946.04.05
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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