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发明名称
Automatic and semiautomatic telephone exchange system
摘要
申请公布号
US1853962(A)
申请公布日期
1932.04.12
申请号
US19300452083
申请日期
1930.05.13
申请人
EDOUARD FRUM;INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DEAKIN GERALD
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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