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发明名称
Course-signaling system
摘要
申请公布号
US1749169(A)
申请公布日期
1930.03.04
申请号
US19220585355
申请日期
1922.08.31
申请人
SWARTWOUT EVERETT W
发明人
SWARTWOUT EVERETT W.
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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