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发明名称
Zusatzgerät an einem Telephon zur Ermöglichung der akustischen Wiedergabe oder der Aufzeichnung ankommender Gespräche.
摘要
申请公布号
CH281907(A)
申请公布日期
1952.03.31
申请号
CHD281907
申请日期
1949.11.02
申请人
BENESCH,ALFRED
发明人
BENESCH,ALFRED
分类号
H04M1/215;H04R13/00
主分类号
H04M1/215
代理机构
代理人
主权项
地址
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