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发明名称
Amplificateur téléphonique
摘要
申请公布号
FR728168(A)
申请公布日期
1932.06.30
申请号
FRD728168
申请日期
1931.12.12
申请人
发明人
BROSSE PAUL
分类号
H04M1/60
主分类号
H04M1/60
代理机构
代理人
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