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经营范围
发明名称
Piezoelectric crystal
摘要
申请公布号
US2486916(A)
申请公布日期
1949.11.01
申请号
US19470793171
申请日期
1947.12.22
申请人
BOTTOM VIRGIL E
发明人
BOTTOM VIRGIL E.
分类号
H03H9/19
主分类号
H03H9/19
代理机构
代理人
主权项
地址
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