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发明名称
Piezo-electric apparatus
摘要
申请公布号
US1990822(A)
申请公布日期
1935.02.12
申请号
US19320598622
申请日期
1932.03.14
申请人
RADIO CORPORATION
发明人
GOLDSTINE HALLAN E.
分类号
H03H9/05
主分类号
H03H9/05
代理机构
代理人
主权项
地址
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