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发明名称
Self-stepping reversible relay chain
摘要
申请公布号
US2935658(A)
申请公布日期
1960.05.03
申请号
US19550519776
申请日期
1955.07.05
申请人
BELL & HOWELL COMPANY
发明人
PERKINS GEORGE D.
分类号
H01H47/00
主分类号
H01H47/00
代理机构
代理人
主权项
地址
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