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发明名称
MEANS FOR SIGNALLING ON RAILWAYS
摘要
申请公布号
CA469161(A)
申请公布日期
1950.11.07
申请号
CAD469161
申请日期
申请人
J. BURNS LIMITED
发明人
KENNETH ALFRED FLETCHER
分类号
主分类号
代理机构
代理人
主权项
地址
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