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经营范围
发明名称
Moistureproof piezoelectric crystal element
摘要
申请公布号
GB677947(A)
申请公布日期
1952.08.27
申请号
GB19500018404
申请日期
1950.07.24
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
分类号
H03H9/10
主分类号
H03H9/10
代理机构
代理人
主权项
地址
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