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经营范围
发明名称
Signal switching apparatus
摘要
申请公布号
US2258706(A)
申请公布日期
1941.10.14
申请号
US19400324192
申请日期
1940.03.15
申请人
KRAGER WILLIAM F
发明人
KRAGER WILLIAM F.
分类号
B60Q1/38
主分类号
B60Q1/38
代理机构
代理人
主权项
地址
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