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发明名称
Procédé et installation pour obtenir un son différentiel objectif par battement des ondes de deux ultrasons
摘要
申请公布号
FR1090119(A)
申请公布日期
1955.03.28
申请号
FRD1090119
申请日期
1953.09.24
申请人
发明人
KLEIN SIEGFRIED
分类号
G08B3/10
主分类号
G08B3/10
代理机构
代理人
主权项
地址
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