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发明名称
Highway dual-light signal
摘要
申请公布号
US1819316(A)
申请公布日期
1931.08.18
申请号
US19300434409
申请日期
1930.03.08
申请人
ALLEN WILLIAM R
发明人
ALLEN WILLIAM R.
分类号
G09F13/04
主分类号
G09F13/04
代理机构
代理人
主权项
地址
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