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发明名称
HIGHWAY CROSSING SIGNAL MECHANISM
摘要
申请公布号
CA342299(A)
申请公布日期
1934.06.12
申请号
CAD342299
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
JOHN E. SAUNDERS
分类号
主分类号
代理机构
代理人
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