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发明名称
Dial switching toll system
摘要
申请公布号
US1823338(A)
申请公布日期
1931.09.15
申请号
US19300495199
申请日期
1930.11.12
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
SKILLMAN THOMAS SAMUEL;FREETH LANCELOT GERHARD;BERRY ROBERT JAMES
分类号
H04M3/523
主分类号
H04M3/523
代理机构
代理人
主权项
地址
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