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经营范围
发明名称
SELF-STEERING SWITCHING SYSTEM
摘要
申请公布号
US3521004(A)
申请公布日期
1970.07.21
申请号
USD3521004
申请日期
1968.07.05
申请人
NORTHERN ELECTRIC CO. LTD.
发明人
ERIC BIERMAN
分类号
H04Q3/00;(IPC1-7):H04Q3/42
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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