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发明名称
Piezo-electric crystal apparatus
摘要
申请公布号
US1884678(A)
申请公布日期
1932.10.25
申请号
US19290386440
申请日期
1929.08.16
申请人
WIRED RADIO, INC.
发明人
OLSON JOHN
分类号
H03H9/09
主分类号
H03H9/09
代理机构
代理人
主权项
地址
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