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发明名称
Dispositif de réglage de fréquence piézo-électrique
摘要
申请公布号
FR993889(A)
申请公布日期
1951.11.08
申请号
FRD993889
申请日期
1944.11.03
申请人
发明人
BERETZKI DANIEL RENE
分类号
H03H3/04
主分类号
H03H3/04
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代理人
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