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发明名称
ELECTRICAL SIGNALLING SYSTEM
摘要
申请公布号
CA441672(A)
申请公布日期
1947.05.27
申请号
CAD441672
申请日期
申请人
AUTOMATIC TELEPHONE AND ELECTRIC COMPANY LIMITED
发明人
PHILIP NORTON ROSEBY;JOHN FRANCIS MACKENSIE
分类号
主分类号
代理机构
代理人
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