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经营范围
发明名称
Procédé dans lequel on confére à un dispositif électromécanique des propriétés piézo-électriques permanentes et dispositif électromécanique obtenu par ce procédé.
摘要
申请公布号
CH286656(A)
申请公布日期
1952.10.31
申请号
CHD286656
申请日期
1948.06.29
申请人
SONOTONE CORPORATION
发明人
CORPORATION SONOTONE
分类号
H04R17/00;H04R17/04;H04R17/08
主分类号
H04R17/00
代理机构
代理人
主权项
地址
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