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经营范围
发明名称
Piezo-electric crystal apparatus
摘要
申请公布号
US1957063(A)
申请公布日期
1934.05.01
申请号
US19320588255
申请日期
1932.01.23
申请人
发明人
分类号
H03H9/13
主分类号
H03H9/13
代理机构
代理人
主权项
地址
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