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发明名称
Signaling
摘要
申请公布号
US1754365(A)
申请公布日期
1930.04.15
申请号
US19250022072
申请日期
1925.04.10
申请人
HADLEY F. FREEMAN
发明人
LEE GEORGE E.
分类号
H01H13/16
主分类号
H01H13/16
代理机构
代理人
主权项
地址
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