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经营范围
发明名称
Tandem trunk circuits
摘要
申请公布号
US1862536(A)
申请公布日期
1932.06.14
申请号
US19300505516
申请日期
1930.12.30
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
HARTLEY GEORGE CLIFFORD;WRIGHT ESMOND PHILIP GOODWIN
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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