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发明名称
System for automatically preventing railway-grade-crossing accidents
摘要
申请公布号
US1785093(A)
申请公布日期
1930.12.16
申请号
US19290382191
申请日期
1929.07.30
申请人
MCKEE MARTIN E
发明人
MCKEE MARTIN E.
分类号
B61L29/22
主分类号
B61L29/22
代理机构
代理人
主权项
地址
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