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发明名称
Switching arrangement for automatic and semiautomatic telephone systems
摘要
申请公布号
US1830935(A)
申请公布日期
1931.11.10
申请号
US19290370673
申请日期
1929.06.13
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DEAKIN GERALD;POLINKOWSKY LIPA
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
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地址
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