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发明名称
Road indicator
摘要
申请公布号
US1774683(A)
申请公布日期
1930.09.02
申请号
US19260143999
申请日期
1926.10.25
申请人
HORN GEORGE F VAN
发明人
HORN GEORGE F. VAN
分类号
G01C22/00
主分类号
G01C22/00
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