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发明名称
RAILWAY CROSSING SAFETY DEVICE
摘要
申请公布号
CA351937(A)
申请公布日期
1935.07.30
申请号
CAD351937
申请日期
申请人
JOSEPH BENJAMIN MARTINEAU
发明人
JOSEPH BENJAMIN MARTINEAU
分类号
主分类号
代理机构
代理人
主权项
地址
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