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发明名称
Dispositif pour faciliter l'écoute d'une conversation téléphonique aux personnes sourdes
摘要
申请公布号
FR1027174(A)
申请公布日期
1953.05.08
申请号
FRD1027174
申请日期
1950.11.03
申请人
CANADIAN BENAUDI COMPANY LIMITED
发明人
分类号
H04M1/215
主分类号
H04M1/215
代理机构
代理人
主权项
地址
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