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发明名称
Changeable indicator
摘要
申请公布号
US3047852(A)
申请公布日期
1962.07.31
申请号
US19580780609
申请日期
1958.12.15
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
SMITH WILLIS R.
分类号
G08G5/00
主分类号
G08G5/00
代理机构
代理人
主权项
地址
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