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发明名称
Perfectionnements apportés aux dispositifs amplificateurs pour appareils téléphoniques
摘要
申请公布号
FR1029642(A)
申请公布日期
1953.06.04
申请号
FRD1029642
申请日期
1950.11.16
申请人
发明人
BRANSON JOHN CHARLES SYDNEY;BRANSON LESLIE CLIFFORD
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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