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发明名称
Perfectionnements aux appareils auxiliaires d'audition utilisant la conductibilité acoustique des os
摘要
申请公布号
FR1022247(A)
申请公布日期
1953.03.02
申请号
FRD1022247
申请日期
1950.07.21
申请人
FORTIPHONE LIMITED
发明人
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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