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经营范围
发明名称
Signaling system
摘要
申请公布号
US2300402(A)
申请公布日期
1942.11.03
申请号
US19400350523
申请日期
1940.08.03
申请人
BEACH CLARENCE E
发明人
BEACH CLARENCE E.
分类号
G08B27/00
主分类号
G08B27/00
代理机构
代理人
主权项
地址
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