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发明名称
ELECTRIC SIGNALLING SYSTEMS
摘要
申请公布号
CA512335(A)
申请公布日期
1955.04.26
申请号
CAD512335
申请日期
申请人
SIEMENS BROTHERS AND CO. LIMITED
发明人
GEORGE H. PARKS
分类号
主分类号
代理机构
代理人
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地址
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