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发明名称
Perfectionnements apportés aux microphones-électrostatiques
摘要
申请公布号
FR676562(A)
申请公布日期
1930.02.25
申请号
FRD676562
申请日期
1929.06.12
申请人
COMPACNIE FRANCAISE POUR L'EXPLOITATION DES PROCEDES THOMSON-HOUSTON
发明人
分类号
H04R19/04
主分类号
H04R19/04
代理机构
代理人
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地址
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