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发明名称
Railway signaling apparatus
摘要
申请公布号
US2008518(A)
申请公布日期
1935.07.16
申请号
US19340740071
申请日期
1934.08.16
申请人
RYAN FRANCIS J
发明人
RYAN FRANCIS J.
分类号
B61L5/16
主分类号
B61L5/16
代理机构
代理人
主权项
地址
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