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发明名称
SIGNALLING SYSTEM
摘要
申请公布号
CA393957(A)
申请公布日期
1941.01.14
申请号
CAD393957
申请日期
申请人
THE LORAIN TELEPHONE COMPANY
发明人
HANS PAUL BOSWAU
分类号
主分类号
代理机构
代理人
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