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经营范围
发明名称
Railway signal system
摘要
申请公布号
US1984840(A)
申请公布日期
1934.12.18
申请号
US19310581546
申请日期
1931.12.17
申请人
PARKINSON JAMES A
发明人
PARKINSON JAMES A.
分类号
B61L23/22
主分类号
B61L23/22
代理机构
代理人
主权项
地址
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