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发明名称
REVERSE EXCITING METHOD OF ULTRASONIC TRANSDUCER
摘要
申请公布号
KR1019920002693(B1)
申请公布日期
1992.03.31
申请号
KR1019890015562
申请日期
1989.10.28
申请人
发明人
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主分类号
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代理人
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