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发明名称
Telephonanlage mit einer Schaltungsanordnung für eine Verbindung zwischen Ämtern.
摘要
申请公布号
CH147613(A)
申请公布日期
1931.06.15
申请号
CHD147613
申请日期
1930.04.17
申请人
BELL TELEPHONE MANUFACTURING CO.
发明人
CO. BELL TELEPHONE MANUFACTURING
分类号
主分类号
代理机构
代理人
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地址
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