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经营范围
发明名称
Dispositif s'adaptant instantanément à tous les écouteurs et casques téléphoniques ou de t. s. f. pour en améliorer le rendement et perfectionner l'emploi
摘要
申请公布号
FR728751(A)
申请公布日期
1932.07.11
申请号
FRD728751
申请日期
1931.12.23
申请人
发明人
CHAMOUX JOSEPH-FERDINAND
分类号
H04R1/10
主分类号
H04R1/10
代理机构
代理人
主权项
地址
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