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发明名称
Perfectionnements aux systèmes téléphoniques et appareil destiné à être employé en combinaison avec ceux-ci
摘要
申请公布号
FR839464(A)
申请公布日期
1939.04.04
申请号
FRD839464
申请日期
1938.07.17
申请人
发明人
MICHAELSON GEORGE
分类号
H04M1/57;H04M1/65
主分类号
H04M1/57
代理机构
代理人
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地址
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