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发明名称
Rochelle salt piezoelectric crystal apparatus
摘要
申请公布号
GB554787(A)
申请公布日期
1943.07.19
申请号
GB19420009542
申请日期
1942.07.09
申请人
发明人
分类号
H03H9/02;H03H9/17
主分类号
H03H9/02
代理机构
代理人
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地址
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