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发明名称
Téléphone haut-parleur électrostatique
摘要
申请公布号
FR677217(A)
申请公布日期
1930.03.05
申请号
FRD677217
申请日期
1929.06.22
申请人
发明人
MACHE GUNTER
分类号
H04R19/02
主分类号
H04R19/02
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代理人
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