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发明名称
Signal-controlling means
摘要
申请公布号
US1777213(A)
申请公布日期
1930.09.30
申请号
US19280281334
申请日期
1928.05.25
申请人
MAGILL CHARLES T
发明人
MAGILL CHARLES T.
分类号
H01H35/38
主分类号
H01H35/38
代理机构
代理人
主权项
地址
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